I'm really bummed out thinking my son might be my last baby. My S/O has continuously said he's done…

I'm really bummed out thinking my son might be my last baby. My S/O has continuously said he's done having babies. Lol like he's going through it. We have a baby girl and I just had my son 2 weeks ago. Since I can remember I've known I wanted 3 kids, 4 if we decided too. And he knew from the beginning that's what I wanted.. I'm definitely not having or wanting a baby anytime soon, since my babies are 10 months apart. I'm getting the mirena for 5 years hoping maybe by the time it has to come out he will change his mind and go for baby #3. Crossing my fingers he changes his mind, I would love to atleast have a family of 5.