Bright red spotting, negative tests, late AF

Cara

Hi,

Freaking out a little and just looking for any advice or hoping to hear from someone that's been through a similar situation. I have pretty irregular/long cycles but based on Glow's prediction I ovulated around 7/15 and AF should've shown up on 7/31. My husband and I had sex all through my fertile window but have been "inactive" since 7/22. I've taken probably 10 pregnancy tests (all different kinds) as recently as today and all have been negative-not even a faint line so I just figured this wasn't our month but I STILL haven't gotten my period and this morning I started spotting bright red blood. Not very much but on and off, no cramps or any other pain. Like I said, my cycles are irregular but spotting isn't normal for me and I've never had discharge this bright. Of course I jumped on google and now I've freaked myself out by reading about bright red blood being tied to miscarriage, etc. But all my tests were negative! Any ideas what could be going on with me? Any help is appreciated.