Is it possible I'm infertile?

Ok so I'm 21 years old and since I first started dating my boyfriend about a year ago we haven't once used condoms. We started getting risky and he's been finishing inside me for about 6 months ago. My cycle is very consistent and never once late. He has a son from a previous relationship so I know it's not him who's infertile. Is there a way for me to test at home or should I speak with my obgyn?