Husband going away… chances please?

St

My husband will be away for almost 3 weeks and luckily seems he’ll be back when I’m ovulating - we may just manage to BD on my peak. It’s a medicated cycle so still want to try. But if he’s away for 3 weeks, will this affect his sperm quality ? I’m worried it’ll be pointless to BD. And no, he won’t sort himself out so to speak.. he doesn’t like to do that. So not an option.