12DPO and brown muddy discharge

I was sure this cycle was the lucky one. I had watery discharge for the past 5 days, had to pee every 15 minutes. I had nausea/ hangover kind of feeling morning and I couldn’t eat! My morning pee was very dark/ orange and I have been having bouts of hunger! My usual cycle is 25 days. Today on DPO 12, CD 25, I saw some brown/ muddy discharge.

I usually get this discharge few days before my period and spotting before period as well. I am feeling very disappointed seeing this discharge today. Do I still have a chance, could it be old blood from the last cycle or has the uterine layer begun to shed already.