Is it possible to spot on the days u are supposed to have Aunt Flo🤔

Michelle

According to glow I'm 3 days late but I started to spot yesterday and it's gone now remind y'all that I took a depo shot BK in April after I had my son before I went home but have not been BK to get another one in July and now my period hasn't shown up could this mean I'm maybe gonna get my bfp or this just one of those times that I just don't have a period (which by the way never happens) my periods are a regular 28 day cycle I only stay on for 4 days and yet I don't I have any period 🤔 I keep having to use the restroom and I feel nauseous at night can someone please help me out here to try and understand this🤦