Endometriosis and spotting mid-cycle

Hi ladies!
​This is the first time I write, but I have been following you for some time :)
​I had a laparoscopy on Nov'13 where I had an ovary and tube removed due to endometriosis. Since then, I've been TTC trying to prevent endo from appearing again.
​My cycles were of about 26 days before the lap, and after the lap they have been a bit crazier, so even when using Glow it is a bit confusing trying to keep track of them.
​This cycle, I had a pinkish discharge on CD 18, 19, 20 and 21. It was just once a day and just when wiping. I was almost sure that AF was early this month, but then I had brownish discharge on CD 22 and 23 and then it stopped completely.
​What do you think? Could it have been a bizarre period or maybe endo-related? I am waiting for AF to come to begin a <a href="https://glowing.com/glow-fertility-program">fertility treatment</a> and I don't know what to think about this.