weird period?

Patricia
Okay so I have the depo shot and the whole time I been on it since December I haven't got a period and I been going every 3 months for the shot and I don't go until June and I started my period like a week ago, then it stopped lasted for like a 4days well I noticed today when I went to pee when I wiped there was blood so I'm like wow I'm starting my period again? But no now it's like brownish with some brown clots what is this? I'm asking cause iv never had a period with the shot and it just randomly came back.