Doctor won't listen to me.

So for several months me and my boyfriend had unprotected sex and I haven't gotten pregnant. I went to the doctors to get birth control but I asked them about it and asked if there was a chance I could be infertile. My doctor just said "you're 19 you don't need to worry about that now". However I would like to at least know for the future but they just pushed it away.  My periods are incredibly painful the more I have it and I'm on it now and for two days I have felt like I'm going to get sick and have felt non stop pain in my stomach and back. I want to cry it hurts so bad.