3rd day of spotting- Expert Charter Plz

[HappyPanda4]

This cycle is so confusing and hope someone can offer some advice. I had pos opk on cd 19 and temp spike on CD21 & 22 (temp vaginally). I thought I o'ed but when temp dropped I discarded bc our A/C was broken and temps didn't fit. When temp dropped started opks again. Pos opk CD 22-25. FF gave me cross hairs o'ing cd 24(discarding temps) and cd 20 (w/o discarding temps) . Very Very light Pink Spotting CD 26 at night and very very light brown spotting yesterday and today. Cycles are usually long 34-42. I have no idea what's going on. Looking at my chart when do you think I o'ed Cd 20 or 24? Big difference between 8dpo and 4dpo.

Thanks!