Quick Question

Ronna • SAHM to my amazing 3 year old Princess. Baby Borja #2 on the way. Due 12-31-17
So I'm 25 days past my D&C and I have some light spotting when I wipe could it be the start of my period or could it be implantation from a new pregnancy? 
how can I have spotting and have a positive faint line on a pregnancy test?i'm sure I just have to wait it out but anybody have any advice?
I know my body so well, that I thinks it's AF because of how my back hurts when I get it, but how can u have a new cycle with hormone still inside of me?