Metal taste ( weird taste in mouth)

Question: so from early this evening, I started tasting this weird taste in my mouth. I don't know how to explain it but am assuming it the metallic taste that people talk about. It has not gone away, even after eating. I have a 25 day cycle, 4 days AF, I'm on cd17 and am 7/8 dpo and next AF is supposed to be due on February 25th! Can you please describe to me what this metallic taste in the mouth, tastes like as I am not sure?