My vagina doesn't make him cum..

Well just as my title says.. my bf can't cum from vaginal sex with me.. hes tried hiding it from me (obviously I noticed) but now that we are ttc it's an obvious issue that needs to be discussed. It's happened maybe twice in 2 years.. Im a bit embarrassed obviously but whatever cause he loves me either way but still.. he can cum from anal or oral but just not vaginal. My ex who was significantly smaller never had an issue so maybe it's not me..? I know he use to cum in his exs so idk.. trying to not get in my feelings about this.. any advice!?

He said something once about how I was Soo wet that he almost couldn't feel anything.. I feel like maybe that's it? 🤷 I do produce allllooott before(mostly)/during intercourse..