swollen after he goes down on me

so my bf went down on me and it was fantastic don’t get me wrong but i’m like lowkey freaked out rn bc one of my *lips* is really swollen and red. i feel like he maybe sucked on something too hard??? idk i can’t exactly go ask my mom what do do. i don’t feel like that’s normal but i also think i might me overreacting. has this happened to anyone else?? someone send help!!