The Three Trimesters

The Three Trimesters

Pregnancy is measured in trimesters from the first day of your last menstrual period to 40 weeks.

The first trimester of pregnancy is week 1 through week 12, or about 3 months.

The second trimester is week 13 to week 27.

The third trimester is from week 28 to the birth.


There are various apps and sites to keep you informed on your babies development during each trimester. Some of the most popular include:


Baby Center

BabyBump Pregnancy Pro

Gerber Pregnancy Calendar

I’m Expecting

Pregnancy Assistant

i Pregnancy

i contraction

Pregnancy ++

m Pregnancy