Hubs can’t finish when TTC

Throw away account. Ever since we’ve been TTC my hubs has had trouble getting himself to finish inside me during sex. He eventually does it but has to do some of the work himself to get himself there. This has never been a problem before. We’ve talked about it and he isn’t sure why it’s happening. Says he wants more than anything to have a baby and can’t wait for me to be pregnant. I’m just confused but am trying not to put too much thought into it. Has this happened to anyone else?