I have a big cut on the inside of my vagina near the hole it happened the other night when I was having sex then there was a lot blood every where but it wasn't my period. The cut must have been from no lubricant but the cut isn't small and keeps bleeding should I go to the doctor?

Yes. Any cut which does not heal rapidly should get looked at by the doctor. It's likely something minor, but you need a proper dressing or possibly a stitch or two to get it right.

It is very unusual to have a cut that involves a lot of blood during sex. Was there anything out of the ordinary that time?

I had something similar during sex a while ago which terrified me there was blood everywhere but I put a little water in the bath and sat there for a few minutes and it slowed right down was sore for a few days but healed up after a while but if it is bleeding a lot for then you should see your doctor as left untreated you could end up with a nasty infection good luck!