When should I test ??!!

One thing that has been consistent in my life has been AF. .. she visits like clockwork. Well, I was supposed to get her today according to GLOW but AF typically likes to arrive on Friday and stay the weekend. Well, she hasn’t come. (No biggie I suppose). WELL - on Wednesday I had light bleeding, more like spotting - and “period dust” when I peed and some darkness when I wiped (like very dark- almost brownish red). I used a pad all day and the next ... just very minimal spotting - occurred on Wednesday, even more less on Thursday then basically nothing on Friday (I think I noticed discoloration a few times when wiping after I peed).

This could’ve been implantation bleeding. Maybe it’s not and my body is playing some sick game with me.

When am I able to test???