I had unprotected sex the last two days where all in all my partner ejaculated in my vagina maybe 5 times. I take birth control and have for years but I changed my prescription maybe two months ago back to my regular one after experimenting with other ones as my insurance changed. I also take Progestrone because I've had a history with irregular and painful periods, currently my cycle is off again and I have been been bleeding for two weeks and recently started taking the Progestrobe combined with the birth control, I am worried because I think this might be the time I am most fertile but I am still bleeding at the moment. How possible is pregnancy?