Hi, According to your description the possible causes are: - While being a contraceptive pills sometimes inter-menstrual spotting can be seen as a side effect. - Pelvic infection can lead to cervical erosion, which can present with post coital bleeding. - Local causes like cervical polyps can also lead to this. - If you are breastfeeding the baby, fluctuations in the serum prolactin levels can also lead to inter-menstrual spotting by affecting the reproductive hormonal levels. As the problem is persisting, better to get examined. So, please consult your gynecologist once and get examined. By clinical examination and investigations like pap smear and ultrasound the possible cause of your problem can be identified and treatment can be taken accordingly. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Sree Gouri S. R., OBGYN