Not getting pregnant concern

Okay so let me start by saying my fiancé and I Been having sex for one year and half I was on bc pills for a couple or month yes so technically we bee. Having unproctected sex for about 4 or 5 month he always *** inside and we have sex a lot every month even on my fertile window is not that I am dying for a baby if it happen yes we will be happy but my concern is why I haven't I am soo scared I won't be able to have kids :( it just seems wierd to me that all the sex we have no baby idk maybe it normal what yall think ?? Should I talk to my doc or no by the way I am 20 pretty healthy my fiancé is 27 healthy too he did smoke weed but stop doubt that's the case tho well ladies if you have any advice please let me know thankyou