Pregnancy Symptoms

First Trimester (Week 1 - 12)

  • Your period stops or becomes very light.
  • You may feel nausea or queasiness, especially in the morning. Some women vomit.
  • Your breasts swell and may be tender.
  • You have to urinate more often.
  • You feel tired.
  • You may become constipated and have heartburn.
  • You may have headaches.
  • You experience mood swings — feel angry, sad, or happy for no reason.
six week embryo

Six Weeks: By twenty-one days after fertilization, the embryo's tiny heart has begun beating.

? DID YOU KNOW... Pregnancy is counted from the first day of a woman's last period. This means that at conception, the unborn child is already considered two weeks old!

Second Trimester (Week 13 - 26)

  • You gain weight.
  • You can feel the fetus moving.
  • The skin on your stomach stretches and may get dry.
  • Your breasts get bigger. It helps to wear a supportive bra.
  • You may experience ongoing heartburn, indigestion, and constipation.
  • You may get nosebleeds.
  • Your feet, hands, ankles and face may swell.
  • A dark line develops on your skin between your navel and your pubic area.
  • A temporary "mask" or darker area of pigmentation may develop on your face.
18 week fetus

Eighteen Weeks: By this time eyebrows, eyelashes, and fine hair appear. The child can grasp with his hands, kick, or even somersault.

Third Trimester (Week 27 - 40)

  • You can see the fetus move from the outside.
  • Your navel pushes out.
  • You begin to get backaches.
  • You begin to walk differently to accommodate the weight of the fetus.
  • You experience painless "practice" contractions.
  • You have shortness of breath.
  • Finally, labor and delivery!
18 week fetus

Twenty-four Weeks: The unborn child is covered with a fine, downy hair called lanugo and a waxy substance called vernix. The fetus still has much growing to do, but some babies could survive if born this early.

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Body Changes

About pregnancy.

Pregnancy is a natural process involving big changes in a woman's body. Most women have uncomplicated pregnancies and their daily routines may not change until the last few weeks before delivery. Other women have difficult pregnancies that change their daily lives right from the start.

Pregnancy typically lasts 40 weeks, or 9 months. That time is divided into three periods called trimesters (3-month intervals), during which different things happen to your body. To the left is a list of some things a pregnant woman may experience during each trimester. If you are pregnant you may or may not experience the changes described here. They may happen earlier or later than they appear on this list, and some may continue throughout the pregnancy.

Take care of yourself.

As soon as you think you might be pregnant, you should visit a pregnancy help center or clinic right away for a pregnancy test. If you are pregnant it is important to learn more about what to expect from pregnancy and how to care for yourself and your growing baby. If you smoke or drink, you should stop immediately — tobacco and alcohol can harm your unborn child.

What's happening inside?

Learn what's going on the inside your body in our online fetal development video.