Pregnancy Week by Week

Reviewed by James Brann, M.D.
Pregnancy Weeks  1 - 14
Pregnancy Weeks 15 - 28
Pregnancy Weeks 29 - 40

First Trimester: 1-14

Learn about the first trimester of pregnancy which is weeks 1 to 14.

During the first trimester of pregnancy, better known as the first three months of pregnancy your body is undergoing many changes.



Among the more common changes or early pregnancy symptoms include; nausea, breast tenderness, frequency of urination, fatigue, skipped period and increase appetite. All of these experiences are perfectly normal and usually are your first indication that you are pregnant.

During your first trimester you will set up your first prenatal visit. The first prenatal visit is one of the most comprehensive of all visits during your pregnancy. At this time your healthcare practitioner will take a comprehensive medical history, conduct a full physical examination and do blood work. In many instances, your healthcare provider will perform an ultrasound exam to confirm the viability of your pregnancy. You may even hear the baby's heart beat.

The most confusing thing about your first prenatal visit, that we would like to point out, is the way doctors calculate your gestational age. The moment of conception is technically when you first became pregnant, but doctors don't calculate your pregnancy weeks or your baby’s gestational age this way. Using the date of conception is too inaccurate; since a majority of women don't know the time and day they conceived. Most women, however, can recall when they had their last period. So doctors use the first day of your last menstrual period (LMP) and the first ultrasound measurements to calculate the gestational age of your baby.

Second Trimester: 15 to 28

Learn about the second trimester of pregnancy which is weeks 15 to 28.

Beginning the second trimester of pregnancy is a welcome relief for many women, especially those that had severe morning sickness and other intense early pregnancy symptoms.

The second trimester of pregnancy spans between three and six months and is often referred to as the "honeymoon stage" of pregnancy due to the decreased number of pregnancy symptoms that some women experience.



You are also starting to grow a beautiful pregnant belly in your second trimester. As your pregnancy progresses, you may start feeling more comfortable and proud of your growing baby bump! Embrace your pregnancy and the beautiful body that is transforming around you. You are almost halfway through your pregnancy and so much closer to meeting your bundle of baby joy!

During the second trimester you will continue to see your healthcare provider every four weeks until approximately 28 weeks, when prenatal visits become more frequent. The symptoms of nausea and fatigue have usually disappeared and you will start to notice physical changes to your body.

The second trimester is also the time when your baby's rapid growth starts. You should be able to feel your baby move between the 17th and 21st week of pregnancy. You may even be able to determine the gender of your baby via ultrasound during the second trimester.

Third Trimester: 29-40

Learn about the third trimester of pregnancy which is weeks 29 to 40.

You are in the third trimester of pregnancy, between six and nine months pregnant. You are only weeks away from meeting your new baby!



As you move out of the relaxing, and exciting second trimester, be prepared for your baby bump to grow even more! During the third trimester, you will continue to put on weight and you may feel like your tummy is about to pop as your due date draws near.

Between 37 and 42 weeks your baby is completely mature and ready for birth. Soon you will be experiencing Braxton Hicks contractions and eventually strong labor pains that will result in you delivering your baby. When you deliver, your baby he or she will weigh on the average of 7.5 pounds and be about 18-21 inches long.

During the third trimester many women start realizing some of the same discomforts they did during the first trimester. Among these include more frequent trips to the bathroom and greater fatigue. Many women also suffer from poor quality sleep during the third trimester, mostly as a result of trying to stay comfortable during the evening.

The third trimester is also one of the most exciting for most women, as they approach delivery. All the discomforts of the third trimester are typically mitigated by the expectation that you will soon welcome your beautiful newborn baby into your home.

top