Pregnancy & Parenting

Trimester Zero: How to Prepare for Pregnancy

Vitabiotics | Published: 19/05/2026

Trimester Zero: How to Prepare for Pregnancy Trimester Zero: How to Prepare for Pregnancy

Trimester zero is the name for the time before pregnancy, when you can prepare your body and overall health ahead of conception. For people planning for a baby, this is the preconception phase and may last for several weeks or months leading up to becoming pregnant. During the trimester zero period, the focus should be on improving diet and overall nutrition, making healthy lifestyle choices, and ensuring adequate intake of key nutrients to support normal fertility and reproductive health, early foetal development and a healthy start to pregnancy.

Highlights

  • Trimester zero is the time before pregnancy, when you can help to actively prepare your body and overall health ahead of conception
  • We explore how you can use trimester zero period to make positive changes to health, nutrition, and lifestyle habits
  • We look at the Pregnacare supplements suitable for trimester zero and when you should take them ahead of conception.

What Does Trimester Zero Mean?

Trimester zero is the name for the time before pregnancy, when you can prepare your body and overall health ahead of conception. For people planning for a baby, this is the preconception phase and may last for several months leading up to becoming pregnant. During the trimester zero period, the focus should be on improving diet and overall nutrition, making healthy lifestyle choices, and ensuring adequate intake of key nutrients to support early foetal development and a healthy start to pregnancy.

Why Is Trimester Zero Important?

Trimester zero is important because it is beneficial to prepare your body for a healthy pregnancy, whenever that may happen. The health of your body before conception is important as foetal development in pregnancy happens very early on, often before you even realise that you are pregnant.

What Should You Do During Trimester Zero?

There are several key steps you can make during the trimester zero period when it comes to preparing your physical and mental health for pregnancy.

We’d recommend taking the following positive lifestyle changes, ideally a few months before you start trying to get pregnant:

Start Key Supplements Including Folic Acid

Take a daily 400µg supplement of folic acid. The UK Department of Health recommend that you take this amount of folic acid for at least one month before and for at least the first trimester of pregnancy. This is because supplemental folic acid intake increases maternal folate status. Low maternal folate status is a risk factor in the development of neural tube defects in the developing foetus. It can also be beneficial to take it for at least 3 months before conception, to help safeguard your nutritional stores. If you are at higher risk of neural tube defects your health care professional may recommend you take a higher dose of 5mg folic acid.

Focus on Nutrition

It’s always important to eat a healthy, balanced diet, but especially so during the trimester zero period. Try to eat a wide range of fruits and vegetables (especially those containing natural folates), as well as foods that have been fortified with folic acid.

Folate, the natural form of folic acid, can be found in a wide variety of foods, including green leafy vegetables such as spinach or cabbage, broccoli, oranges and yeast extract.

Although a healthy diet would normally provide you with enough folate, it’s not possible to get the additional folic acid that’s recommended to support a pregnancy through these natural sources alone. This is the reason that daily dietary supplements are recommended.

It is also important to stay hydrated, so make sure you drink plenty of water each day.

Check Your Health

In the trimester zero period, it can be helpful to visit your GP to discuss your plans and see if they have any advice. You can also check you are up to date with all vaccinations.

If you are currently receiving medical treatment or taking long term medication, it’s very important to check with your doctor to make sure that your medication is safe to use during pregnancy, or if any changes will need to be made to your treatment before you try to conceive. Before you stop taking any medication that you have been prescribed, always consult your doctor.

Make Positive Lifestyle Changes

It is natural to want to make positive lifestyle changes for both you and your partner ahead of trying for a baby. These types of changes can involve adopting a healthy, balanced diet, maintaining a healthy weight, cutting down on caffeine and stopping drinking alcohol, giving up smoking and starting regular exercise.

Make time for both physical activities and mental wellbeing during the trimester zero stage, and focus on reducing stress where possible.

Track Your Cycle

Ahead of and during the trimester zero period it can help to track your menstrual cycle so you’re in tune with your body and aware of your most fertile days. Read our post on when you are most fertile and how to track your fertility.

Remember Your Mental Health

Deciding to try for a baby is an exciting step in your life. However, the trimester zero period can be overwhelming, especially if it is lasting longer than you’d expected. Try and focus on maintaining a positive mindset at the same time as maintaining your physical health. Staying positive and focusing on self-care can make a difference to your emotional well-being. Read our post on how to stay positive when trying to conceive.

Why Is Folic Acid So Important In The Trimester Zero Period?

Folic acid is an important B vitamin (vitamin B9) that plays an important role in the process of cell division, which is why it becomes particularly important in the very early days of pregnancy when cell division is at its most rapid. Because of this, women’s bodies need extra folic acid both before conception, in the trimester zero period, and during early pregnancy to help support the development of their babies.

Supplemental folic acid intake increases maternal folate status*. Low maternal folate status is a risk factor in the development of neural tube defects in the developing foetus. NTDs occur when the brain and spine fail to form properly during the first 28 days of pregnancy, before many women even realise that they are pregnant.

It is for this reason that it’s so important that women increase their intake of folic acid BEFORE they try to conceive. As well as playing a role in the process of cell division, folic acid also contributes to maternal tissue growth during pregnancy.

Folic acid is water soluble, which means that our bodies can’t store it very well. This is why you need to ensure that you’re getting a fresh supply of folic acid every day.

What Is the Recommended Diet for Trimester Zero / Preconception Health?

When you are in the trimester zero period and preparing your body for pregnancy, you should eat a diet that is healthy, varied and balanced and includes a wide range of colourful fruits and vegetables, starchy foods, protein sources and some dairy.

The basics of a healthy lifestyle when you’re trying for a baby are the same for women and men:

  • Consume a balanced and varied diet, rich in vitamins and minerals
  • Eat plenty of fruit and vegetables (at least 5 portions each day) to boost vitamin and mineral intakes
  • Choose iron rich protein foods such as lean meats, eggs, beans and lentils
  • Try to include one portion of oily fish each week, e.g. salmon, trout, mackerel, sardines
  • Avoid shark, swordfish and marlin, and limit tuna (fresh and canned) due to high mercury content
  • Include low fat dairy foods every day for extra calcium, such as low fat milk and yoghurts
  • Avoid anything containing high amounts of fat and sugar and choose healthier snacks, such as fresh fruit, dried fruit and fortified breakfast cereals
  • Drink lots of water.

Read more in our post on what to eat when you’re trying for a baby.

3 For 2 On All Vitamins & Supplements
3 For 2 On All Vitamins & Supplements

Get 3 for 2 on all products and free UK delivery when you shop with us.

What Supplements Are Recommended During Trimester Zero?

Folic Acid

In addition to a healthy diet, NHS advice is that women should take a daily 400µg folic acid supplement from the time contraception stops and until at least the twelfth week of pregnancy. This is because folic acid contributes to maternal tissue growth during pregnancy. Supplemental folic acid intake increases maternal folate status. Low maternal folate status is a risk factor in the development of neural tube defects in the developing foetus.*

*A beneficial effect is obtained with a supplemental folic acid daily intake of 400µg for at least one month and up to three months after conception

Read more about why folic acid is important before and during pregnancy

Vitamin D

Take a daily supplement of 10µg vitamin D, as advised by the UK Department of Health for everyone, including during pregnancy and breast-feeding.

Vitamin D contributes to normal absorption and utilisation of calcium and contributes to the maintenance of normal bones and teeth. As outlined by the UK Department of Health, all pregnant and breastfeeding women should take a 10µg vitamin D supplement daily. The main source of vitamin D is sunlight; however, it is also found in oily fish, eggs and full fat dairy products, and can be added to margarines, some yoghurts and breakfast cereals. Since vitamin D is found only in a small number of foods, it might be difficult to get enough from food alone.

Vitamin B12

During the trimester zero period, try take at least 2.5µg vitamin B12, which contributes to normal red blood cell formation.

B12 works very closely with folic acid. Research suggests* that taking a daily supplement of at least 2.5µg of B12 (the EU RDA) with your main meal, in addition to the recommended daily 400µg supplement of folic acid, may further reduce the risk of NTD. B12 is mainly found in animal and dairy produce, so B12 supplementation is especially important for women following vegetarian or vegan diets.

*Addition of vitamin B12 to folic acid supplements to optimise the prevention of Spina Bifida and other Neural Tube Defects, Professor John M. Scott, Biomedical Sciences Institute, Trinity College, Dublin 2, Ireland

Zinc

Zinc is an important nutrient to consider during trimester zero as it is scientifically proven to support normal fertility and reproduction.

What Supplements Are Not Recommended During Trimester Zero?

Vitamin A

It is advised that you avoid vitamin A during the trimester zero period, as well as beauty products containing retinol, which is vitamin A. This is because when you are pregnant, vitamin A can potentially harm your unborn baby.

Regular Multivitamins

You should avoid taking regular multivitamins as these may contain vitamin A and insufficient levels of folic acid and vitamin D. Look for a specialised trimester zero supplement suitable for the preconception period, such as the Pregnacare range for before pregnancy.

Which Companies Offer Prenatal Vitamins suitable for Trimester Zero In The UK? Where Can You Buy Them Online?

Vitabiotics Pregnacare Conception supplements provide expert nutritional support for women trying for a baby, in the trimester zero period. They are designed to be taken before you get pregnant and include 400µg folic acid, the exact level recommended by the UK Department of Health from the start of trying to conceive, because supplemental folic acid intake is recommended as it increases maternal folate status and low maternal folate status is a risk factor in the development of neural tube defects in the developing foetus. Pregnacare Conception also includes vitamin D, to help maintain normal bones and teeth, and vitamin B12. Plus zinc, which is scientifically proven to support normal fertility and reproduction.

Our Pregnacare Before Pregnancy Supplements range includes Pregnacare Conception for her, Pregnacare Him & Her Conception, a specialist dual pack for men and women trying to conceive with zinc to support normal fertility and reproduction. Pregnacare Conception Max includes L-methylfolate, a more advanced form of folic acid, a high purity Omega-3 fish oil capsule, providing essential fatty acids DHA and EPA, plus higher levels of key nutrients compared to Pregnacare Conception.

Find out more about each product in our ultimate guide to Pregnacare.

You can buy Pregnacare trimester zero pregnancy supplements online here.

FAQs About Trimester Zero

Is Trimester Zero A Medical Term?

Trimester Zero is not an official medical term, but it’s one that is commonly used to describe the preconception period before pregnancy.

How Long Is Trimester Zero?

Trimester zero doesn’t have a fixed length. It’s a term used to describe the preparation period before pregnancy rather than a fixed time frame.

Most people use trimester zero to mean the period about 1 to 3 months before trying to conceive, because is recommended you take folic acid for at least 3 months before you get pregnant to prepare your body for pregnancy.

There are no guarantees about when you will become pregnant, as there are varying factors that are different for everyone, meaning the length of time that trimester zero lasts will be different for everyone.

When Should I Start Taking Folic Acid?

NHS advice is that women should take a daily 400µg folic acid supplement from the time contraception stops and until at least the twelfth week of pregnancy. This is because folic acid contributes to maternal tissue growth during pregnancy. Supplemental folic acid intake increases maternal folate status. Low maternal folate status is a risk factor in the development of neural tube defects in the developing foetus.*

*A beneficial effect is obtained with a supplemental folic acid daily intake of 400µg for at least one month and up to three months after conception

Do I Need Supplements Before Getting Pregnant?

NHS advice for women before getting pregnant is to take a daily 400µg folic acid supplement from the time contraception stops and until at least the twelfth week of pregnancy (folic acid contributes to maternal tissue growth during pregnancy) as well as a daily vitamin D supplement (vitamin D has a role in the process of cell division and contributes to the maintenance of normal bones and teeth).

NHS advice on taking supplements before getting pregnant can be found here.

In addition, other supplements can be beneficial to take before getting pregnant (see section What Supplements Are Recommended During Trimester Zero?).

Can Lifestyle Affect Fertility Before Pregnancy?

Your lifestyle can potentially affect your fertility, which is why it can be important to make positive lifestyle changes ahead of trying for a baby, for both you and your partner. Lifestyle changes you can make include eating a healthy, balanced diet, maintaining a healthy weight, cutting down on caffeine and stopping drinking alcohol, giving up smoking, starting regular exercise and focusing on reducing stress where possible.

You can also read our post on trying for a baby in 2026.

Meet the Author

Gill Crawshaw

Gill Crawshaw

Pregnancy & Parenting Content Writer

Gill Crawshaw

Pregnancy & Parenting Content Writer

Gill Crawshaw is an experienced writer and editor specialising in pregnancy, parenting and family life. With over 18 years of experience in digital content creation, she has developed a strong focus on supporting parents through every stage of the journey, from conception to early childhood.

Barnabas Santa

Comments (0)

Submit Comment

Please note, comments must be approved before they are published