Pregnancy by weeks (analysis, lifestyle, videos) Pregnancy by weeks Pregnancy Week Calculation Recommended analyses, lifestyle and videos with fetal development Url The analyzes specified here are selected from the study of the literature, where there are a number of differences of opinion. We strongly recommend that you consult a gynecologist or family doctor. Trimester of pregnancy Trimester I (Weeks 1 - 14) Trimester II (Weeks 15 - 28) Trimester III (Weeks 29 - 40(42)) Select the Trimester then Pregnancy WeekWatch Videos at the bottom of the page