Having children

Please don't think I'm being rude at all in this post.

I love my fiancé. We are literally wonderful together. Of course having kids is a huge thing for us. He comes from a big family.

I have a son from a previous relationship. And he has totally accepted my son as his own (his dad isn't in the picture)

Now please don't find this part rude. But I have a passion for kids with special needs. I volunteered at an orphanage in Africa a few summers ago and it was the most amazing experience of my life. I was especially fond of working with the kids who had cognitive and physical impairments. I would love to adopt a child with special needs. I work as a PT and support kids every single day. I volunteered in pediatrics my first year of university.

My fiancé wants to have biological kids sooner rather than later. I want to start the application process to adopt and he doesn't seem terribly interested. Like I know he cares about kids, I just don't think its what he wants for us specifically.

Just give me some input here. Please!?

Edit. Let me also just add, that physically speaking, I'm not ready to carry another child right now. Yes I have a son already. But that was a very hard pregnancy for me. So I know that it will likely a response will come up about how we have to be on the same page...but right now, we are both on different pages. Not bad pages. Just I prefer adoption for now and having a baby later on down the road. Whereas he seems to just want the baby now