Fertility

So I’ve had a lot of unprotected sex in the last year or 2, both during and outside of ovulation and there has been a few times when my period comes late (the latest being about 9 days) but it always ends up coming eventually. Now I’m not saying I’m trying to get pregnant because I’m not at that point in my life but I don’t know whether to be worried that I’ve never had a pregnancy ‘scare’. Could anyone give me some insight on whether I should worry about my fertility or if I’ve just about managed to dodge it every time...?