Childbearing Year

By Peg Plumbo
From ParentsPlace.com

A full-term pregnancy lasts approximately 10 lunar months, or 280 days, from the first day of the last menstrual period (LMP). This calculation assumes a cycle length of 28 days. If your cycle is not 28 days, you will do all the calculations from an adjusted LMP date, that is, an LMP date adjusted as if you had a 28-day cycle, then adjust your due date as described on page two.

How "far along" you are can be calculated in two ways:

1. From the date of your last menstrual period
OR
2. From the date of conception, which typically occurs two weeks
advertisement after your last menstrual period, which is called weeks from gestation.

An even easier way to determine your due date, is to plug the date of your last menstrual period into our Due Date Calculator.