How to use the timeline

The timeline gives you a top level overview of the major milestones and key events from conception to birth, and approximately when they happen.

40 weeks, 9 months, 282 days? Confusing? The Pregnancy timeline gives you a quick overview of where you are in your pregnancy.

To make it easier for you, we made all dates in the timeline relevant to your pregnancy.

Most people talk about pregnancy being 9 months long (divided into three trimesters). Most health care providers, however, refer to a 40-week pregnancy, starting with your last menstrual period (LMP).

Pregnancy normally lasts between 37-42 weeks, calculated from the first day of your last period. The extra two weeks is added because gestational age is counted starting from the last menstrual period (LMP), rather than from actual conception / ovulation. So when medical staff say you are 4 weeks pregnant, you are actually physically only two weeks pregnant.