1st Trimester

Calculating due date

So, I'm still in the 2ww, but just in case (power of positive thinking!), wondering how I should calculate.  The first day of my last period was Dec. 20, but I got it at 11 p.m.  Would you consider that Dec. 20 or Dec. 21 for due date calculating purposes?  TIA!
Lilypie Maternity tickers

DD: 6/21/10
DS: 10/11/14

Re: Calculating due date

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