My Boyfriend and I had unprotected sex for 5 seconds (first time) then we just stopped bc it was sore, I couldn't get my hands on plan B, but today we used a condom and it was ok. So my question is, if we use a Condom and I'm not on birth control are the chances of getting pregnant slimmer? And should I get on birth control asap?? Or is just using a condom fine?