Long..SO and Orgasm

Posting anonymously because this is embarrassing. I'm 24 weeks pregnant and my belly is getting big and I feel like it's affecting my sex life with my SO. He has been so awesome during this pregnancy and I'm so grateful. I'm a ftm so I dunno if this is normal behavior...for the past maybe six weeks he'll have sex with me, but he never makes me orgasm anymore. We have been together for 3 years and he's always been...more than generous in that department except lately. I have made nonchalant passing comments about it and he just laughs. Then when we go to bed, we have sex, he finishes and sleeps. It makes me want to cry. I just want to know if anyone else has experienced this?? Thanks ladies!