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4weeks
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Highlights this week

It's a date! Find out your baby's due date.

Your baby-to-be is now an embryo and is starting to develop organs.

Whatever you consume, so does your baby. Make sure you know all about folic acid and vitamin D.

Baby development at 4 weeks

The ball of cells dividing in your uterus is now an embryo, about the size of an poppy seed. The next five weeks are especially critical to your baby's development. The rudimentary placenta and umbilical cord, which deliver nourishment and oxygen to the baby, are already functioning. For more information on your baby's development this week click here.

embryo made up of hypoblast and epiblast
Your baby at 4 weeks
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Your baby is the size of a poppy seed

Poppy seeds illustration
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Pregnancy symptoms at 4 weeks

If your baby wasn't planned, this may be the first time you have an inkling that you're pregnant. Don't worry, our early pregnancy resource centre has all the information you need to get your pregnancy on track. If your pregnancy test was negative or inconclusive but your period still hasn't arrived, you can repeat it now.

Need help with reading it? Find out if the faint line on your home pregnancy test means you're pregnant.

It may seem an odd time but in fact it's a great idea to start an exercise routine now. Exercise helps you develop good muscle tone, strength and endurance. It helps you manage the extra weight you'll put on (or prevent you putting too much more on if you're already overweight), gets you fit for labour -- and makes getting your figure back after birth easier too. Choose a safe, moderately vigorous activity you like: walking and swimming are great choices when you're pregnant.

You might also want to do some easy yoga stretches -- there are special classes adapted for pregnancy. Make sure the exercise instructors who teach you are qualified to instruct pregnant women and, if it isn’t a class specifically for pregnancy, let the instructor know that you are pregnant. Know your limits and make sure you don't overdo it if you are new to exercise. If you are already athletic, we also have some tips for you.
embryo in uterus at 4 weeks
Your body at 4 weeks
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Pregnancy Tip

"I found out I was pregnant and boom, my breasts were really tender right away. So I started wearing my sports bra all the time -- it really helped." – Jennifer.

Other hot topics this week

Make an appointment with your family doctor to learn about your prenatal care options, including whether you'll see an OB/GYN, family doctor, or midwife. You'll also want to ask about what you should be doing at this stage, like taking folic acid.

Will you be able to work throughout pregnancy? Find out about safety at work, especially if you work with x-rays or chemicals or have a strenuous job.

Do you want to take prenatal supplements as part of a healthy diet for pregnancy?

Is it safe to jog or run when you're pregnant?

Feeling light-headed? Find out what you can do about dizziness and breathlessness.

BabyCenter’s talented team of editors and writers has decades of experience creating inspiring content.

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