Regular spotting or implantation bleeding???

Shelby

I just got off the depo shot about 5 months ago and switched to the pill. I know the depo can stay in your system for a while after you discontinue it. Well I started spotting very very lightly (like bleeding once and then it stops). This has been going on for about 3 days now and it hasn’t happened today at all. I’m very confused of which this bleeding is, so any comments or questions is appreciated!!