This is going to sound crazy my due date is April 28,2012. I told the doctor my lms period she said I was off by a week. I'm trying to figure out when I got pregnant. I need to know when I got pregnant.

It is impossible to know exactly when you got pregnant. If you are concerned about paternity you are going to have to wait until the baby is born so a DNA test can be done.

You can at best come with a date that is give or take two weeks. There is no way to know an exact date.

If it is a matter of what person of more than one person, you will just have to wait till child is born and get a DNA test