Im on the birth control, Mirena, the 5 year IUD, i had it put it after the birth of my first child. I have had it in for 14 months now and it had been effective, me and my fiance have sex without condums, and it had always been effective. I made a mistake and had a one night stand, like i stated I am on Mirena, we used a condum in the start of the intercourse but took it off durning intercourse, but he pulled out before he ejaculated. I called my health department about the plan B pill, and they wouldnt give it to me, saying it was unnessacary, because of the Mirena. I have a very high level of anxiety and am having anxiety attacks over this, what are my chances of the possibilty of a pregnancy? Please help, i am loosing my mind over this!