Hello dear,
Do not worry.
It is most common complaints among girls.
In majority case it is not serious and will go on its own.
Following are the causes of bleeding during intercourse
1. Trauma to vaginal wall (If penetration without lubrication)
2.
Atrophic vaginitis due to lower estrogen levels
3. Infections in the vagina
4. Bleeding from cervix (As it contain superficial blood vessels)
If it will not stop or will occur next time.
Please consult with doctor.
Do your
hormonal profile like: estrogen,
progesterone, FSH, LH
To exclude cervical cause do
PAP smear test.
But i think in your case, I think trauma is most common cause.
If you have pain just take tablet
meftal spas two times a day till pain is there.
Hope this may help you.
Wish you good health.
Best regards
Dr. Sagar