Am i normal?

Its not that i want to get pregnant. I don't. Although i think a baby would be 'cute' and 'nice', i'm not stupid i know it wouldn't work. And i want to live first. Its that i'm scared. I've been having totally unprotected sex for the last 5 months ish, and i'm not pregnant. Is that normal? I mean, its stupid not using anything, i know that too. I've been to the doctors about going on the pill, decided i want the implant. But im not pregnant, and should i be? Im scared that maybe i can't have kids. We spoke about fertility in the drugs i've been given for Crohns but i always said if it affected my fertility at all there was no chance i was taking it. But maybe there is something wrong. I almost don't want the implant, just to make sure i can get pregnant. Stupid i know.