Hi,
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Foul smelling vaginal discharge is associated with vaginal or cervical infection. The spotting/bleeding during or after intercourse could also suggest possibilities like vaginal 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 vaginal bleeding/spotting that you describe without examining you. The exact cause can only be made out after careful evaluation. Presence of infection, cervical dysplastic changes, endometrial polyps, uterine fibroids, ovarian cysts, hormonal derangements, endometritis can also cause problems in conceiving (infertility). Consider visiting your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause for the abnormal vaginal bleeding/spotting that you describe. Treatment as appropriate (based on examination findings and investigations results) would be started to help you control the symptoms and get pregnant. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. Avoid sweat accumulation in the area. If infective cause is detected, and if you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection, and avoid having intercourse while being on treatment.
Take care.