I just need some advice

So I came off the depo in November and first period started 20th last month for 10 days, i started doing opks the day it stopped so I knew as I've never done them or tried for a baby before, so every single one is negative, not like oh I see a line I'm talking like squinting to just about see something, this has gone on every day so 24 days and not even a light line. Then last Wednesday I got a faint line in a pregnancy test then the morning after negative, I've had what seems to be implantation bleeding since Saturday morning, because of all the negative opks glow has pushed AF forward by just over a week so I'm super confused cause I don't think I ovulated at all, any wisdom anyone can share would be wonderful