Advertisement

What happens in my body during the first trimester of pregnancy?

Hilda Y. Hutcherson, MD
OBGYN (Obstetrics & Gynecology)
The first trimester of pregnancy is a time of drastic hormonal changes. Although your developing baby is tiny, big things are happening to you. Fatigue, nausea, constipation, and breast tenderness are common. Feeling lightheaded is another common complaint of early pregnancy. In addition, all of the hormonal changes cause mood swings.

During the first trimester, you should begin to visit your doctor regularly for prenatal care.

The Good in Bed Guide to Sex and the Baby Years

More About this Book

The Good in Bed Guide to Sex and the Baby Years

Available at a substantial discount for a limited time only, thanks to support from K-Y(R) Brand!Once you get down to the business of baby-making, the advice will pour in: books, magazines, in-laws,...

Your body has begun to nurture a new life. During the coming nine months, you will experience enormous physical changes as the embryo grows from a single fertilized cell into a fully developed baby.

Despite the excitement of being pregnant, the first trimester can be particularly challenging. You may experience fatigue, constipation, decreased sex drive, increased urge to urinate, tender or sore breasts, increased vaginal secretion, and nausea or increased appetite. Moreover, the nausea or vomiting commonly referred to as "morning sickness" is clearly misnamed because women who have nausea often feel sick throughout the day.

During the first trimester, your breasts may become larger, full and tender, and your areola, the area around your nipple, may begin to darken. Exhaustion is also common during the first trimester.

Not all women experience all of these changes. The absence of any of these first trimester experiences is not an indication that something is wrong with your pregnancy.

Our Bodies, Ourselves: Pregnancy and Birth

More About this Book

Our Bodies, Ourselves: Pregnancy and Birth

ALL THE INFORMATION YOU NEED TO MAKE WISE DECISIONS ABOUT YOUR PREGNANCY AND THE BIRTH OF YOUR CHILD -- FROM THE EDITORS OF THE CLASSIC "BIBLE OF WOMEN'S HEALTH" Pregnancy and birth are as ordinary...

Continue Learning about 1st Trimester Of Pregnancy

What changes will I experience during the first trimester of pregnancy?
Boston Women's Health Book CollectiveBoston Women's Health Book Collective
For many women, sexual desire decreases during the first trimester of pregnancy due to fatigue, brea...
More Answers
Should I call my doctor if I have heavy bleeding during my first trimester?
Dr. Wayne R. Young, MDDr. Wayne R. Young, MD
Contact your provider if you have heavy bleeding in the first trimester—you may be having a miscarri...
More Answers
Healthy Pregnancy: Your First Trimester Guide
Healthy Pregnancy: Your First Trimester GuideHealthy Pregnancy: Your First Trimester GuideHealthy Pregnancy: Your First Trimester GuideHealthy Pregnancy: Your First Trimester Guide
This pregnancy guide explains your baby's growth, as well as the aches, weight gain, morning sickness and other changes during the first trimester.
Start Slideshow
If I'm Pregnant, Should I Be Worried About Spotting?
If I'm Pregnant, Should I Be Worried About Spotting?

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.