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Unprotected intercourse followed by heavymenstrual cycle or painful cycle generally indicates possibility of pelvic inflammatory disease You need to get internal examination n pelvic sonography done and may be a course of antibiotics Cervisitis which is infection of mouth of uterus is very common n easily diagnosed in internal check up. Good course of antibiotics will improve fertility outcome Regards Dr Manjiri

It can be a random anovuation cycle

You should get Transvaginal Ultrasound Scan for determining Endometrial thickness. Pl get it done and send the report with images.