? pregnant, but not sure ?

Recently slept with a guy, basically was a booty call. Now he's acting like a complete jerk! Biter didn't use a condom at one point and he pulled out seconds before he came. What percentage is it that I'm actually pregnant. I missed my last two BC pills. I'm not taking the Plan b pill because it f 'd up my periods. So what percentage could I be pregnant? How long do I have to wait to see if I'm pregnant since I'm on BC with irregular periods.