Overthinking it?

I've been living with my boyfriend for about 2 months now.  About two weeks afterwards he started sleeping on the floor in the extra bedroom. When I asked why he just said it makes his back feel better. And I just said ok if it helps his back. But then I noticed he would only stayed in bed after we had sex. And then the next day he is sleeping on the floor in the extra bedroom. We found out we are pregnant last week. We had a fight yesterday and I wanted to bring it up but I didn't and then today I've gotten the cold shoulder from him. And I can't help thinking that he doesn't want me anymore. I know I don't take up the whole bed. And I make sure their is always an extra blanket for him when he does sleep in the bed. I let him do as he ease I don't bug him where he is going who he is with or what he is doing as long I as I get a text that he is going to be late. Am I just overthinking all this?