Help? Anyone gone through this? Warning: photo

Heather
I'm on prometrium because I get small cysts on my left ovary (of course, the one I always feel pain in when I ovulate) and I had very messed up cycles, sometimes skipping them for 5 months at a time. It's gotten my cycles to a more normal point and I haven't had any more cysts, so there's a positive.This cycle, I got my peak OPK on CD 12 & 13, and for the first time I felt it from my right side. With the problems always being on the left, we felt extremely hopeful. I've never had a problem with dryness but my cm is typically pretty creamy all month so we used preseed for the first time this month. Since using it, I've been extremely dry. On CD 23, 11 dpo, I had some slight cramping at work toward the end of my shift. When I got home, I had some brown blood in my underwear. I've never had brown blood outside of the last day of my period. We got pretty excited thinking maybe this was from implantation. My SO has been convinced this is the month since before I ovulated haha. Today, CD 25, the brown gross stuff is still here. I'm impatient so I took a test and it was negative. What else could this even be?