Okay so I had sex with this guy about a week and a half ago (12-3-15) and he pulled out and came on my back, but just to be safe I took plan B the next day. 3 days ago (12-9-15) we had sex again, this time he finished in the condom but we went bare for a little while before and after the condom. The day after I took plan B again. So neither time he finished inside me (maybe some pre cum) and I took plan B 2 times in 1 week. Should I be worried about being pregnant or should I be okay?