You have something else going on. Your foreskin has absolutely NOTHING to do with any infection.
Impregnating your wife takes only a union of your sperm with her ovum. If your semen is being ejaculated from the opening, your equipment is working well enough to get the job done. The question is either the viability of the sperm or the ability of your wife to conceive. That's it! They urologist certainly knows better than to say what he told you, but when the Mercedes payment is due, all ethics go out the window!