Husband demands sex

I am 17 weeks pregnant and my libido has decreased a lot. My husband wants to have sex every day before going to sleep and before he goes to work ( at 5 am). This morning I told him no I was just too tired. When he got home from work he told me if I thought it was okay that I rejected him in the morning. Which I responded that he has to understand if I don’t want to. Then he started saying how it’s supposed to be my responsibility and started demanding me to give him oral sex. Of course I got offended and I told him we both had to agree on having sex if not that was not okay. Well he got super offended and told me he was never going to bother me for sex anymore that we were just going to be roommates. We have sex every night even if I don’t feel like it but my belly is starting to grow so it’s getting uncomfortable and he doesn’t seem to understand that it’s all because of the pregnancy.

I’m even considering splitting up because if he doesn’t understand me now that I’m pregnant with his child then what do I expect from him.

Do you think I’m wrong in saying no?