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Pregnancy calendar

How to use the calendar

Enter your Expected Due Date below and press 'go'.

Due Date:

Working out your Expected delivery date (EDD)
In order to determine the date when you baby is due you need to know the date on which your last period began. The expected date of delivery is based on the supposition that pregnancy lasts 40 weeks from the beginning of your last period and a regular 28-day cycle. The majority of normal pregnancies end between two weeks before and two weeks after the calculated date. A pregnancy of 38 or 42 weeks duration is quite common and will have no adverse effect on you or your baby.

However, if you have not had at least three cycles following a previous pregnancy, miscarriage, abortion or stopping an oral contraceptive pill, the first date of your last period cannot be relied on to predict your expected date of delivery. In these circumstances your date will normally be calculated by an examination of the size of your uterus or an ultrasound scan of the foetus.


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