Fertility

I have been in a long term relationship for a while now and have been having fully unprotected sex. Most of the time my boyfriend finishes inside of me. We have sex at least once a day and sometimes up to three times (he’s great lol, gotta love him). I’m not on any form or birth control and haven’t been in about a year. With the amount of times we’ve had unprotected sex and gone all the way, I feel like I should’ve become pregnant by now and am starting to think I may be infertile or something similar (the unprotected sex hasn’t been going on our entire relationship but has for about the last 4 months). Is this normal? How do you go about figuring out whether or not you are infertile? Should I be worried about it?