Last month on the 23 I got on the birth control shot and they said will might spot here and there so i am like okay.. Well.. I have been spotting for three weeks ( because the spotting stared on the 7th of this month also the blood is pretty dark and i am 20 years old / 138 / 5 3.5 / i workout like three times a week/ and when i pee it has a oder kinda { well it doesn't smell normal } i haven't gain nothing from it/ and i get the shot on my butt area ) is that good or bad?