GaryJohnson
Senior member
Technically the date of conception for medical determination is done by the last day of the last period the woman had.
For example, when my GF got pregnant we knew the date of conception because it was only 1 day that I saw her since I live in a different town. However, although we went to the planned parenthood the next day, since her last period was 3 weeks prior, the date of conception for medical purposes was put on that date. So she was considered to be in her 3rd week instead of about 5 days later.
Are they taking the woman's word as to when her last period was or is there an absolute medical evaluation that can determine when that was after the fact?