6 positives (faint) but 1 negative? Please help!

This photo isn’t great because you can’t quite see the lines (turn brightness up on phone and you can get a better look) I’ve wrote the dates of when I took them and when in the day I took them. The first I took isn’t there, I took it on the 8th BUT I had a slight bleed about 2 hours after that test but decided to test again on the 12th and there was a faint line. Next day, faint line again about the same consistency as day before. On the 14th I took another that came back darker than the first three. 15th was lighter than the day before (confusing!) then the 16th came back darker or just as dark as the 15th (different tests so hard to tell) then on the 17th (last night) the line is non existent! Why?

The bleed I had was when my period was due (or 2 days early according to this app) so came around time period was due regardless. I had slightly mild cramps, not like normal start of period. It was brown with a bit of red on and off for 2 days, VERY light. After those 2 days it turned to pink when wiped and pinky watery discharge then stopped after 2 days. Again it was very light and very unusual for my period. I understand it could be a chemical but considering the way these tests have needed up, it just seems really weird. I have also had slight pregnancy symptoms! I suffered with miscarriage back in June. Please help. Thanks!

Blood test tomorrow but need someone else’s experience etc to calm me haha!