13dpo, brown discharge and BFN!

I'm 13dpo, I'm 2 days late on my period and for the last 3 days I've had brown discharge/old blood, enough for a pad. But it seems to be drying up and stopping? Usually I get brown discharge which gets heavier and within a day or so it will turn into blood.

I also have quite a dull ache in my right ovary. I usually have very painful cramps and the pain will come with the brown discharge but this month, nothing! Just the pain in the right ovary, almost a burning sensation and bad back.

Just done another test and it's BFN!! I suppose I'll just wait to see if AF comes but has anyone else had this?