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Stages of Pregnancy Week by Week

Pregnancy Week 4

Discover your baby's latest fetal developments in week four of your pregnancy and get tips on sharing the exciting news with your friends and family.

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Month 1

Watch Your Baby's Growth

An Embryo Forms: Weeks 4 to 8 of Pregnancy
An Embryo Forms: Weeks 4 to 8 of Pregnancy

Chances are you have no idea you're pregnant yet¿but your body is already hard at work. Watch as the egg undergoes its wondrous transformation to embryo.

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Your Changing Body

You just missed your period and the test came back positive -- that's right, you're pregnant! Can't bear to fasten your bra in the morning? For most women, breast tenderness is the first physical sign of pregnancy -- even before telltale morning sickness strikes.

Your Developing Baby

So what's going on in your womb this week? Your embryo may be minuscule, but trust us: Super-important developments are already under way. This week the embryo splits into two parts. One half will become the placenta, a special tissue that delivers must-have nutrients and oxygen to your baby throughout your entire pregnancy.

Tip of the Week

Don't be surprised if your doctor doesn't schedule an appointment to see you until your 8- to 12-week mark. Many healthcare practices have potential mommies-to-be come in for a blood test with a nurse first to confirm pregnancy.

woman holding pregnancy test

Your Week 4 To-Do List

1. Missed your period? Take a pregnancy test.

Week 4

An Inside Look

Take a unique look at Baby's development inside the womb this week.

Pregnant woman crossing off the days until the birth

Your Pregnancy Calendar

Organize your doctor's appointments, save your ultrasound photos, and more--all in one place!

Ask Parents About Week 4

We've got answers to your questions from experts and parents who've been there.

See All Questions or Ask Your Own

Everything in Pregnancy Week 4

More About Your Pregnancy in Week 4

Your Baby

Your Body

  • Your Hormones

    Here come those pregnancy hormones! Find out what you can expect.

  • The Fatigue Factor

    Feeling exceptionally exhausted is a common early-pregnancy symptom. Here's how to manage when you feel less than spunky.

Your Self

  • Handling Work and Fatigue

    Feeling tired during your first few weeks of pregnancy is normal. But how should you handle it at work? Try not to turn to caffeine -- ...

  • Sex During Pregnancy

    Your sex life will likely ebb and flow during pregnancy. Be sure to be both respectful of your partner and vocal of your own needs and ...

Diet & Exercise

  • Dealing with Diabetes

    Are you diabetic? If so, your condition might make your pregnancy more complicated. However, you can lessen the risk to you and your ba...

  • Get Moving

    Although you may not feel like it, getting up and exercising can help you boost your energy. But make sure you know the basics first.

  • Relieving Morning Sickness

    Don't skip out on your exercise regime! Try to get moving, even if your tummy doesn't agree.

Q & A

First Trimester

Second Trimester

Third Trimester