I find it soon weird...

I'm 33 weeks pregnant with my second child. With my first child my bf was OK to have sex with me right up until I had the baby. Now with this pregnancy he won't have sex with me anymore. He says he's afraid of putting me in labour which almost feels like an excuse. I don't know what's wrong with him but it sucks. I told him and showed him that it's good for me. But he still wont. Lol