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Due date calculators

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heliotrope Thu 22-Oct-09 09:42:22

Just put my last period date and cycle length into MN and bbc due date calculators and they are two days out - BBC says 18th June (from 11th Sept last period and 28 day cycle) and MN says 16th.
Pretty sure BBC is right as remember from my first baby that the pregnancy is counted in full weeks, but anyone know for sure?
I know it's not an exact science but just wondered!

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