Okay well I just started having sex a while back, and now it's quite a few days late. We used a condom and i've had a few late periods before, like a few months ago it always came on the 14, then switched to the 7th, and now it hasn't come at all. (it was supposed to come the 7th) and I was just wondering if maybe sex could make it late or something like that, since the last time I had sex it came a few days late. I'm not taking birth control, but we used condoms and it didn't slip off or break. Okay thanks a bunch. :)