Husband support

Does anyone else have a husband who isn't being supportive? We've always wanted kids. He finally realized last month that he was actually ready for them. We found out Saturday that I'm pregnant, made 5 weeks on Tuesday. But he's not being supportive. It feels like he doesn't want to accept that it's real until he has some proof (apparently two positive pregnancy tests (mine and the doctors) and no period isn't enough proof). He keeps saying he doesn't want to get excited in case I have a miscarriage and it's very upsetting.