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The symptoms that you describe could also suggest chances of pregnancy (due to chances of contraceptive failure). If you suspect chances of pregnancy, you should consider visiting your doctor/gynecologist for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). If pregnancy is ruled out, further evaluation would be needed to look for the underlying cause. Pain and bleeding during or after intercourse are not normal symptoms and suggest chances of infections, internal injury/trauma, cervical erosion or dysplastic changes, uterine fibroids, endometrial polyps, endometritis, ovarian cysts, hormonal derangements affecting the bleeding pattern, anemia etc. It is difficult to comment on the cause for the abnormal bleeding that you describe without examining you. The exact cause can only be made out after careful evaluation. If the bleeding is from vagina, visit your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause for the bleeding that you describe. Treatment as needed (based on examination findings and investigations results) would be started to help you in controlling it. Consider being in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet. If infective cause is detected, get your partner also treated simultaneously to prevent chances of re-infection.
Take care.