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Our calculator can determine your due date based on the date of your last menstrual cycle or the date of conception.
Your baby-to-be is now an embryo. Over the next six weeks, its nervous system, connective tissue, and organs will start to develop.
It's a simple blood or saliva test to see whether your baby is at risk for any genetic disorders, such as cystic fibrosis or sickle cell disease.
You're in your first month
Baby development at 4 weeks
Your little embryo
Your embryo consists of two layers called the hypoblast and the epiblast, from which all of your baby's organs will begin to develop over the next six weeks. This is the time when she'll be most vulnerable to anything that might interfere with her development.
Your baby at 4 weeksTap the plus for more details
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Your baby is about the size of a poppy seed
Your embryo's outer cells are tunneling into the lining of your uterus. Spaces form within this layer for your blood to flow into so that you'll be able to provide nutrients and oxygen to your growing baby.
Your body at 4 weeksTap the plus for more details
Amniotic sac and yolk sac
The amniotic sac contains amniotic fluid and will enclose your baby and cushion her as she grows. The yolk sac will produce your baby's first red blood cells and blood vessels.
See what fraternal twins look like in the womb this week.
Pregnancy symptoms during week 4
Don't worry. Many women don't feel anything yet this week. In fact, most early pregnancy symptoms don't start until about 6 weeks.
Tender, swollen breasts
Breast tenderness can be one of the earliest signs of pregnancy. It usually starts around 4 to 6 weeks and lasts through the first trimester.
For many women, exhaustion is one of the first signs of pregnancy. But other women hardly seem to slow down at all.
Nausea or vomiting
Morning sickness can strike at any time of day. It usually starts around 6 weeks of pregnancy but can begin as early as 4 weeks. Some women have cramping as well.
Basal body temperature stays high
If you've been charting your temperature and it stays elevated for 18 days in a row, you're probably pregnant.
Pregnancy checklist at 4 weeks pregnant
Take a pregnancy test
If you haven't already, you should be able to find out whether you're pregnant. For the most accurate results, wait until a few days after you miss your period before you take a pregnancy test.
Make a prenatal appointment
If the test is positive, call your doctor or midwife and schedule your first prenatal appointment. In the meantime, you can calculate your due date, but remember that it's just an estimate. You're just as likely to go into labor any day during the two weeks before or after.
Get help if you've been trying for a while
If you've been trying to conceive with no success for a year or more (or for six months if you're over 35), talk to your healthcare provider about a workup for you and your partner to spot possible fertility problems.