I got my last period march 8. but my due date is December 30 2013 so when did I most likely get pregnant march or April I am 8 weeks and 1 days of may 21 2013... Please help I need answers

If paternity is in question you will have to have a DNA test run after the baby is born.

Subtract 8 weeks from today's date. That will give you that approximate time

Calculation of conception dates or due dates is an inexact science and could be off a few weeks either way. So there is no way to tell for sure whether you conceived in March or April.

If the first day of your last period was March 8, your due date would be December 14 and you would have conceived around March 21.

So, you see, gestation dating is an inexact science. You will need to wait until this baby is born for a DNA test.