Thanks for writing to DoctorSpring.com with your health concern.
It is very likely that you have injured / abraded yourself around that area during the sex.
As such, it should heal on its own.
Is the bleeding continuous or has it stopped since ?
Just apply local cold ice compresses and some aloe vera gel.
It should be alright in a couple of days.
If the fresh bleeding continues or you have other symptoms such as difficulty in urination, extreme tenderness, then you need to see a gynecologist for an internal evaluation.
All the best.
Please feel free to discuss further.