JUQ-140 My lustful wife

It has been 12 years since I married my beloved wife and 10 years since I tried to get pregnant. Just when I was about to give up, I was lucky enough to have the child I had longed for, and I was thinking that from now on I would do my best for the family, but I was very surprised. Does that mean my sperm is infertile? Whose child is in my wife's womb? All kinds of doubts are forming and it's driving me crazy. I can't focus on my work, so today I decided to bring it up with my wife.