Hello,
Thanks for posting your query at DoctorSpring.com
Well, there are a few possibilities for post coital bleeding.
Cervical lesions, infections, polyps, uterine polyps,cervical growths are common reasons.
You should be having an internal exam by a gynecologist, also a Pap smear, pelvic ultrasound scan.
Please get that done at the earliest.
All the best
Please feel free to discuss further.
Regards.