Major Metal Mouth!

Kate • 33. Canadian. TTC #1 since Aug. 2014. PCOS. MC in June 2016. Uterine septum and ovarian cyst removed January 2017. Started Metformin January 2018.
Ugh! I CANNOT get the taste of metal/salt out of my mouth! It is pretty disgusting. 
I had moments of a metallic taste at 4dpo, 6dpo, and 8dpo. Today is 9dpo, and the taste of metal has become more prominent and consistent. 
​I've read that this came be a (weird) early pregnancy symptom. 
​How can I get rid if the taste?