I'm confused

Me and my fiancé are trying to conceive for the second time . Our first son wasn't planned so we want to plan this one . 

I got off the depo shot in November of last year and I got my period back in February . Anywho I am supposed to be in my fertile window with high chance of conceiving today . Well I noticed that I have been spotting or bleeding dark brown blood . Kinda medium not very light 

I don't know if it's normal or not and why I am seeing this while I should be ovulating. Will this affect my ovulation? Am I even ovulating? Or do you ladies think it's something more serious ?