Evaporation line

Hello everyone. I just want to know if there is still hope for a bfp. 4 days ago I had very light postive right at 10 mins on first signal from Walmart. As I dried it became darker. I took a frer and it was negative. Since then all test have been negative. Today I had pinkish brownish clear discharge but no period. Is there a chance that was a real evap and I could be pregnant still and this may be implantation bleeding? Has anyone ever had this happen? Or could it be a chemical pregnancy? I felt different this cycle than I have before.