Very negative OPKs and spotting this cycle

This cycle has been very unpredictable.

AF was very short this cycle and lighter than normal - only 3 days with a maximum of a medium flow.

Ever since I have had spotting most days (normally brown, but there has been a couple of days with pink/red spotting).

I had faint and very negative opk’s CD8,9 and 12. But from 14 onwards they have been pretty much blank. I normally ovulate around CD17 and will get a positive on CD16 - but I’m currently CD15 and my test this morning was still pretty much blank.

Feeling very disheartened and confused about this whole cycle, has anyone else had something similar?