Pregnancy Trimesters Week by Week: Simple Overview
Pregnancy is commonly divided into three trimesters. Each trimester includes different developmental milestones and different experiences for the pregnant person. Due date calculators can help estimate timing, but every pregnancy is different.
First trimester
The first trimester usually covers weeks 1 through 12. Early development begins, and many people experience fatigue, nausea, and breast tenderness.
Second trimester
The second trimester usually covers weeks 13 through 26. Many people feel more energy, and fetal movement may become noticeable later in this stage.
Third trimester
The third trimester usually begins around week 27 and continues until birth. This stage often focuses on growth, monitoring, and preparing for delivery.
Use our pregnancy due date calculator to estimate due date, trimester, and pregnancy progress.