Male infertility?

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So 4 years ago, my husband found out he had a cyst on his testicle, not on the scrotum the actual testicle. Anyways. When he found out he went to a specialist and everything and they said it should be okay unless it ever causes him any pain. Well to this days he hasn’t had any pain with it and pretty much forgets about it. But now that we agreed to ttc he’s been really worried that this would affect his fertility. What do you guys think? I personally don’t think so, how long should we wait to get this checked out if we still haven’t gotten pregnant,