spotting keeps getting darkerer?

Hi,
Welcome to ehealthforum,
The dark vaginal discharge/spotting could be suggestive of old oxidized blood, trauma, vaginal infections, possible ovarian cysts, cervical bleeding due to infections or dysplasia, pregnancy, due to use of other medications, etc. The exact cause can only be made out after careful evaluation. Visit your doctor/gynecologist for further examination and investigations to look for the underlying cause. Treatment as appropriate (based on the examination findings and investigation results) would be started to help you to control your symptoms. Avoid further sexual intercourse until you are cleared by your doctor/gynecologist. If infective cause is detected, get your partner also treated simultaneously to prevent chances of re-infection. Drink plenty of water. Take adequate rest. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid tight fitting clothes.
Take care.