My fiance accidentally slipped the head of his shaft into me about 3 days ago. As a virgin it stung a bit, so i immediately said "ouch!" and he pulled out. (it was just the tip of him and less than half a second) he did not ejaculate while inside me, nor before the contact. He did shower and urinate before the contact. But naturally i was still concerned, especially since neither of us have any previous experience, so 46 hours after contact i took a "plan b" single dose tablet. The contact took place 5 days after my last period ended and my cycles are generally 26-29 days long. I am 29 years old. What is the likelihood that this encounter would result in a pregnancy?