Ob-Gyn questions? Ask a gynecologist online.
If you have never had sex before it is possible this episode tore the hymen- which can certainly cause pain and bleeding.
I would certainly tell your doctor who will examine you
But if the bleeding is decreasing and pain getting better, that is likely what it was and you will be OK
Good luck and please rate my response
As I noted this is likely normal- as long as the bleeding is improving it is reassuring.
Do you have further questions?
If not please rate my response