Thanks for the query.
The possible causes for your bleeding are :
- Early onset of menstrual period.
-Post coital tear.
-Local causes like cervical erosion, cervical polyps etc.
- Uterine causes like polyps, endometrial abnormalities etc.
If the bleeding and pain are persisting, better to consult gynecologist once and get examined.
By examination, local causes, possibility of tears etc can be ruled out.
If she recommends go for ultrasound
If no abnormality detected, possibly the bleeding could be your normal menstrual flow.
If any problem detected in examination or in ultrasound, you can get treated accordingly.