Fertility question!

So I have sex regularly cause it's great! I let my boyfriend get off in me when he wants and when he doesn't. I am not trying to get pregnant and I'm not not trying to get pregnant. I'll be given a baby when it's time ya know? But my boyfriend thinks he can't have kids from a past accident when he was younger (like 16) he hit his junk really badly on a bike and he said the doctor said there's a possibility he'd never have kids. He's got off in me a few times while I've been ovulating these past few periods after I told him to be careful but I have not gotten pregnant.

Could he not be fertile? Am I just lucky? If he isn't fertile how has <a href="https://glowing.com/glow-fertility-program">fertility treatment</a> worked for those who have used it for future reference?