Hallow Dear,
Since your periods have finished just 7 days ago, it must be your day 12-14 of the cycle. The cause for the bleeding may be attributed to one of following causes:
1. Since you felt hurting while he entered inside you, it is quite likely that it was rather a rough entry which could have caused little
injury to the private parts giving you pain associated with little bleeding. Such injury is usually at the centre of the back edge of vaginal opening. Nothing need be done for this; just give rest to the part by observing sexual abstinence for 5 days. If it is hurting considerably, you may apply some local antiseptic or antibiotics cream. Usually the wounds in the perineal area heal by 5th day.
2. About 14th day (to be precise 14 days before the next menses) is the day of egg release. This event may be associated with little bleeding with some
abdominal pain. It is known as mittlesmerch. Nothing need be done for this.
3. Watch for any such future events of
bleeding after intercourse. Some times it could be due to infection or any polypoid lesion of the mouth of
uterus or cancer. If the pattern recurs, you should report to a Gynaecologist for further evaluation.
However, considering your history, I feel, the first cause should be responsible for this hurting bleeding.
I hope this helps you.
Dr. Nishikant Shrotri