Hi, and thanks for your medical question on eHealth's Ask a Doctor forum.
A symptom of brownish discharge on birth control pill is normal. It can also be blood mixed with normal vaginal discharge. Well the two most common causes of inter menstrual spotting or bleeding or brown discharge from vagina between periods are pregnancy and birth control pills. Other causes are hypothyroidism, cervical dysplasia, cervical polyps, cervicitis, vaginitis, cervical and uterine cancer, uterine fibroids, hormonal imbalance, use of blood thinners, genital ulcers, STDs and stress.
Common causes of vaginal bleeding after sex are STDs like Chlamydia, gonorrhea, and trichomoniasis, cervical polyps, yeast infections, endometriosis, cervical dysplasia which is a precancerous condition, uterine polyps, uterine fibroids and cervicitis.
If you have a history of unprotected sex, then STD should be ruled out first. Please consult your gynecologist as a confirmed diagnosis cannot be given on net. Hope this helps. Take care!
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