Pull out method 🤷🏽‍♀️

Soo me and my husband since we’ve been together +5 years always been using the pull out method and I haven’t gotten pregnant, so he thinks maybe we just can’t. We never tried to get prego tho and at the same time not preventing it but lately my period have been irregular and kindof has me thinking maybe something is wrong with me and I can’t, I’m 21 and never had irregular periods before like this,but they will be early or late by a couple days randomly, it’s that normal?! .. am I overthinking?! Or maybe he is right?! 😩🤦🏽‍♀️🤔🤷🏽‍♀️ I NEED ADVICE!!