period vs implantation

I finally thought my periods were getting back to normal after stopping the depo. I woke up this morning and I seem to have got my period? It's strange cause usually everyone I get I get a warning and am usually in some kind of pain but this one nothing. From what I've read about implantation bleeding I don't think it looks like that. It's red and a bits of clots. I really thought this month was my month.