I couldn’t cum!

I am currently 33 weeks pregnant and I am getting bigger as each day passes. Today I was getting intimate with my boyfriend but my body started to get gassy for whatever reason. So I started getting embarrassed about that and that also the fact that I’m huge! I just don’t feel sexy anymore. But I kept going for my man, I wanted to please him. Even though I still felt good, I just couldn’t cum! All my thoughts were keeping me from being just as pleased as he was. I feel so embarrassed and dumb