I'm 19 years old. My boyfriend and I have been together for a year and we waited 6 months before we had sex for the first time. I was a virgin and I wanted to wait until I knew he was the right one. I've been on Tri Sprintec and have been through a full pack and took the third pill of the next pack lastnight. We had sex today and he finished inside of me. I don't want to take the plan b because I know it really messes up my cycle and I don't want that. But I'm really worried. am I or could I be pregnant?