My boyfriend and I had sex for the first time Monday morning, we didn't use a condom but I had given him oral before and had tasted the pre cum so I know it didn't go inside me. he also pulled out way before he came so no sperm was in me. it was my first time having sex in about 8th months so I experienced a bit of bleeding after. Thursday of the same week we had sex again this time with a condom and I bled a little during (I was also still a little sore from sex previous that week) I am now having a light flow of blood not enough to fill up a regular size tampon and I have period cramps. I'm on birth control and I take it regularly and never miss days, how high are my chances of getting pregnant?