Vaginal Bleeding (Spotting) or Metrorrhagia occurs irregularly between the expected menstrual periods. It is often caused by hormone imbalance, endometriosis, or uterine fibroids. It is commonly happened to peri-menopausal and menopausal women due to instability of ovarian function. Young women can experience this problem also due to hormonal imbalance (disruption of the balance between progesterone and estrogen) caused by emotional stress, anxiety, birth control medication, or abuse of street drugs.
A woman may see blood on her underwear, bedclothes, or toilet tissue after urinating. Heavy bleeding might occur resulting causing her to soak through more pads or tampons than she normally does.
Progestin (Progesterone-based Birth Control Pills)
This is an alternative birth control for some women if they can’t tolerate the side effects of estrogen or have a history of blood clot and other cardiovascular problems. Progestin is formulated in various forms such as pills, IUD, implant, and injection.
Progestin in hormone-based birth control generally causes a heavy vaginal discharge, due to the over-stimulation of the cervix by excessive progesterone. The artificial hormones Progestin and Conjugated Estrogen can cause spotting from the uterine lining. When the spotting is very small, it will stay inside the vagina and mix with cervical mucus. When the spotting blood is oxidized, the resulting vaginal discharge becomes dark black or brown, depending on the quantity of the spotting blood and the duration it was trapped inside. If it is trapped for too long, yeast can change its color to black or produce a bad smell.
Talk to your Doctor/Gynecologist if you have this issue.