Is there a pill that you take before you have unprotected sex?

No, there is no such pill that you would take before unprotected sex and be sure that you would not get pregnant. It takes birth control pills two to three weeks to become effective in preventing pregnancy, so, the answer is simply no. And not to mention what other sexually transmitted diseases are you risking with doing this, no matter if you have been in relationship or not. the only option you could have is for both of you to first get checked out for STDs and then you need to see an ob-gyn so you maybe could get birth control shot like Depo provera, but that all depends on your age. It really is not the good idea any way you look at it. Please reconsider - don't do anything just because you feel forced to in any  way. You have your future to think about, so why risk it because one bad choice?