Fertility question!?

ashton • trying to have some baby dust magic

How would I go about/setting up to find why I haven’t gotten pregnant yet for future reference? Been with my partner for 5 years havnt been able to get pregnant,he has a child from a previous relationship(I know it could still be a problem on his side) but my mother also had a hard time getting pregnant with my younger siblings so I’m on the fence it’s me? Would it matter if I’m just looking for answers without him in the picture?