Okay, so i was a virgin and my boyfriend was in the military and he was on leave for a few weeks. We had sex the first time then a few days later we did again. Then about a week later i had my period. We had sex again a few times while i was on my period because we had to make his time here worth it since he was leaving in a few days. i've heard that if you do it while on your period there is less of a chance of becoming pregnant. It's about a month later and i haven't had my period yet for this month. I'm 3 days late and really starting to freak out. I haven't shown any other symptoms. We used condoms every single time we had sex and were very careful when we did it. I know there's always a chance that i'm pregnant, but is there less of a chance that i am? Plus, i just realized i'm on this medication called Topamax. I don't know if anyone else has heard of it. But one of the side effects is missed period. And i've never had any missed periods, but i've been on the medication a few months, but they just increased the dosage 3 weeks ago. I'm hoping this is why? Can somebody help me out? Possibly reassure me that im not prego? :(