As per your symptoms you seem to be suffering from a hormonal imbalance and if your bleeding is precipitated by intercourse, you should exclude local lesions like vaginitis
, cervical erosions and polyps. Yet, as you had unprotected intercourse
( even a pre ejaculate can cause conception if you are around ovulatory period), it would be advisable to exclude pregnancy
. Please see a specialist for a complete evaluation and further management. Take care.