The first trimester begins on the first day of your last period and lasts until the end of week 12. This means that by the time you know for sure you’re pregnant, you might already be five or six weeks pregnant! A lot happens during these first three months.

The second trimester includes weeks 13 through 27 of a pregnancy. In the second trimester, the baby grows larger and stronger and many women begin showing a larger belly.

Fetal development continues during the third trimester. Your baby will open his or her eyes, gain more weight, and prepare for delivery. The end of your pregnancy is near!