what a nightmare AF! I have had that happen, hardly anything then back on...... if temps don't come down and you don't get what you feel is a proper af I would test again just to be sure.
AS one cycle I had bright red bleeding on 10dpo for 36 hours, then it stopped and changed to clear cm, I tested and bfp! unfortunately tho for me my temps had already dropped and af came on the next day so was a chemical.