I have been on a combination birth control pill for 8 days.  I started taking the pill on the first day of my period.  I'm very good about taking my pill at the same time everyday, except for today I took it 30 mins early.  Other than that, I take it at the same time everyday and haven't missed any so far.  Anyways, tonight I had sex without a condom.  We were doing anal but, he accidently (?) slipped it into my vagina once, he didn't cum in my vagina, he came in my ass.  I'm just wondering the chances of me getting pregnant?  Do I need to take Plan B, or am I okay?  If it makes any difference, I took Plan B on two separate nights on Nov 24 and Nov 26, because we had sex with a condom but, it broke (btw never use Trojan magnum thin condoms, broke both times, second time we wern't even being that rough).