*please no judgement*

about a year ago when i was 18 i used to hook up with a close guy friend. we would hook up quite a lot for a few months. we never used protection(we were both checked and free of STI's)and always used the pull out method(genius, i know). but looking back and putting pieces together, and also checking my ovulation/fertile days(i've been tracking my period for over 3 years now and my ovulation days are pretty accurate), i've had unprotected sex plenty of times with him during those days but never got pregnant. half of me is thinking "well, duh, he pulled out!" but another part of me is thinking "well, what about precum?" i guess im just worried about my ability to get pregnant now. i know i probably seem kinda dumb but is there a way to get checked for infertility at the doctors or something along that?