okay so last month i got the depo shot. they said by the 2nd shot, i shouldn't have my period at all. well i didn't get my period this month, instead i got this nasty black/brown discharge that feels like my period when i feel it comes out (gross i know). it's enough to make me wear a liner. somedays i don't have to, but i do anyway. i've read some things saying that birth control can do this to a person. will this ever go away though? normally i would get this after my period ended.