Did my boyfriend fart during sex?

Hahaha so today my boyfriend and I were having sex. I was on top and I moved a certain way and he said "Oh f*ck yeah." which made me laugh. (He doesn't usually talk like that during sex, it was funny :P) Anyway, after I laughed he said "Sorry, it just came out..." and he looked really embarrassed. I laughed more and said "You never tak like that though, sorry for laughing." and he said something like "Oh! What I said... Haha yeah xD couldn't help it. It felt good." and he looked relieved. I have a feeling he farted, and thought I laughed at that. Haha what do you think? :) thanks!