Fingering and finger nails

So my husband doesn't finger me often bc it does nothing for me. Well yesterday we were really in the moment and I told him to finger me for foreplay I know it turns him on by knowing how wet I am (sorry for the details) and my gawd I feel like his finger nails scraped the hell out of my vagina I had him to stop after 10 seconds. Well now (6hrs later) it feels sore down there like a paper cut feeling. The thing is his nails aren't too long and it shouldn't have been that uncomfy. How short are nails meant to be for fingering ?