If : If you had a normal period at the end of december, you weren't pregnant at that time. If you only had sex with your boyfriend after your last period, he is the father of your baby. (by the way, your due date -- somewhere around october 3rd -- is calculated from the first day of your last menstrual period, which was december 27. This is also how your doctor determined how far along you are in your pregnancy.) congratulations, and good luck!
Answered 10/4/2016
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