Sterile boyfriend??

Shelbie

So my boyfriend and I aren’t super trying for a baby. But we definitely aren’t preventing either. But he always makes comment about being sterile. He’s never been to the doctor about it. So not sure if it’s true. He tried with his last girlfriend years before me and they never could get pregnant. Just want advice on who to go see about it. I’ve googled and it really just came up with home tests you can do. But not sure if I trust those. Thanks in advanced.