Trimesters
Nov 27, 2010
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Pregnancy lasts approximately 40 weeks and is calculated from the first day of your last period, although conception will probably not have taken place until around two weeks after this.Pregnancy is divided into three parts known as trimesters.
The first covers weeks 1-13,
The second trimesters weeks 14-26, and
The third trimesters week 27 until birth.
