so i had sex with my bf on July 7th we used a condom and bought a plan b pill just to be safe..this was also before ovulating..on july 14th we had sex again we used a condom and again bought an emergency contraceptive this time it was plab b it was a different brand Aftera. i dont know if the brad matters..this time was after ovulating..finally july 16 we had sex again but did not use a condom he pulled out but i was on top so we i moved a little bit some got on my clit and i clean up withing a minute i dont think any got on the vaginal opening but im not sure ...we bought a plan b pill afain for this last time..each time i took it it was no more that 3 hours after sex...i know the plan b with mess up my period but should i be really worried if im pregnant