I had sex with my ex through out the month of January but he always pulled out. I had sex with my boyfriend new years and the 28th. Both times he came inside me. But I have no idea what the last day of my period was. I think it was the first week of January. I am due oct. 13. :confused:

If you don't know when you ovulated then you likely won't know when you conceived.

Also, pulling out doesn't prevent pregnancy.

The only way to know who fathered your child is to get a DNA test once the child is born.

Good luck.

Pull-out method is not a method at all. You can get pregnant from pre-ejaculation.

I don't think it was your ex during the month of January, because you said that "i had sex with my boyfriend new years and the 28th" so he must still be your boyfriend. Unless you were broken up during January and are back together now.

Since you don't know when your period was, it's hard to tell who is the father without a DNA test after the baby is born. My guess, it's not your boyfriend. Last year my due date was Oct. 20th, the last day of my period was Jan. 13th I think. So there is a good possibility it's the guy from January.