Period or implantation?

Okay so I'm coming off one round of depo and I have been feeling a little strange I took some tests and I think they were all negative(some were inconclusive) then yesterday I had what I thought was the start of an odd period (not really the same red color as period blood) and this morning when I checked there was no blood at all. And it's about noon and I still haven't bled. Just wanting some opinions and speculations