Possible fertility issue??

So I've been with my fiance for just about 5 years now. We have been having unprotected sex our whole relationship and only use the "pull out method" I'm honestly very surprised I haven't gotten pregnant yet because we always have sex when I'm fertile/ovulating! (And other days throughout the month of course) should I be seeking insight from Dr's to see if I have a fertility issue? No known issues in my family other than my sister had to get a couple shots because her body was trying to attack her baby in utero and she is the only female in my family this has happened to.