Embarrassing Ends

hey guys! this is so cringe but I figured who better to consult than you 😂 so it's been happening for a while... I fart right before I cum. My boyfriend will be going down on me and I'm getting close, getting real into it, then as I'm about 2 seconds from cumming, a lil fart slips out. It totally ruins the mood! I've been managing to pass them off as queefs (he's rather inexperienced) so it won't gross him out. Is this normal? How do I stop it??