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- Understanding Pregnancy Trimesters
The First Trimester of Pregnancy: An Overview

Get an upclose look at what to expect during the first trimester of pregnancy.
Most couples expect to get pregnant at some point. When it's the first time, they suddenly realize what a gamble pregnancy is. However, be reassured. Most pregnancies—whether it is a woman's first or fifth—usually go without a hitch.
The first 12 weeks are a wonderful, exciting, and sometimes scary time. Let's talk about the most common concerns during this time—and, hopefully, reassure you.
Why Would I Suspect I'm Pregnant?
Besides missed menstrual periods, several symptoms can indicate that you're pregnant:
- Breast tenderness, because estrogen stimulates breast tissue
- Constipation, because progesterone slows down the intestinal tract
- Cravings, although doctors don't really know why
- Mood swings, also from fluctuations in hormonal levels
- Queasiness and nausea, possibly caused by the rise in the hormone hCG, which resembles elevated thyroid hormone, a cause of nausea
Of course, if you have any of these symptoms, get a pregnancy test. There's no other way to know for sure.
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