To take the pill or Not?!

Ok so my fiance and I have been having unprotected sex for a few weeks now, ovulation is this week. Well we had said if we got pregnant than so be it but if not we were going to start birth control after my next period, well I went to the doctors today to get the pills prescribed in case. They said they would give me a pill to expel anything in there just, or they wouldn't prescribe the pills. I wasn't going to take it but I said I would pick it up at the pharmacy or they wouldn't prescribe the birth control. So I came home and told my fiance about it and he said he didn't know what we should do.... I thought his answer would be to just wait and see like we had planned. Well just now he said, "tomorrow we are going to go get that pill so you can take it" I'm very upset at this because you can't help but think of all the good things if I was actually pregnant. Any advice?