Fingers in butt

Last night having sex my husband but his fingers in his butt while penetrating me. 😳😳 I feel really uneasy about it. I asked him after did you just finger you butt while doing me and he said yeah. I didn't want to make things awkward so I said oh ok lol but wow that really made me think where the hell did this come from? 😳 help me what should I do?????