i started taking birth control about 2 months ago, at the beginning of this month i had forgot to take several pills, i had been trying to catch up, my boyfriend had sex without a condom for about 15 seconds, then he stopped. This was on May 8th, on the 9th i took the Plan b one step. I did not try to catch up on my pill trying to wait to see if i would start, it is now June 12 and i have not started, ive taken 4 pregnancy test all being negative, if i were to be pregnant tomorrow would be 4 weeks. What is the likely hood of me being pregnant?