Having sex w/o condoms

ok, my and my gf has been having sex,me w/o using condoms. we both dont like it, also she just ran out of b.c maybe 2 weeks ago. we do it like one a week, an i do the pull method thingy. but wen i pull i have to kind of jerk it a few times then i cum. shes been using the bathroom more often, and been tired. also shes on some other medication. So we called the doctor, and they said that shes not pregnant, and its because she stopped taking the b.c, so her period will be changed. And they said that her other medication maybe the cause of her tiredness. but most of the time shes tired (cause she only stays home, and cant go out to much), so not sure if we are both paranoid, because me and her thinks shes pregnant. she got her period last month, and she took the store test. it said negative, but we might jsut go doctors sometimes this week. thanks in advance