I just want to know if my girlfriend is pregnant. We had sex on sept 20th. She's supposed to have her mens on Oct 4th. Does that mean that she was ovulating at the time we did it? (counting 14 days before the expected start of mens). She told me she bled on Oct 7th, but only little, and the next they it was gone. Could it be implantation bleeding? I know implantation bleeding occurs 6 to 12 days upon fertilization . . . but Oct 7th would be the 17th day assuming if the egg has fertilized on Sept 20th. Until now, she hasn't had her mens and it's the 15th already. We didn't use protection and used pull-out method instead. I know it's not effective. Can anybody tell me if she might be pregnant or should we wait until the end of this week until she bleeds . . . ?