I haven't had a period since I didn't renew my depo in November, 09. But my first scan put me at 11 weeks with a lmp of jan 27. Although I didn't have a period at all. And my due date was put at Nov. 3. On Feb 3, I started having unprotected sex with my boyfriend so when did we conceive? My periods though, are irregular when I do get them and come every month and 2 weeks and are only around for 3-5 days. Can anyone help,

If your due date is November 3, most likely you conceived on or about February 11 or 12. However, if you are concerned about paternity, you will have to submit to a paternity test to be sure.

I didn't have sex with anyone else but my boyfriend since we started having sex. But I did before I met him in the beginning of January.