Salty Taste

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.
My mouth tastes like I've been eating pure salt! I've had loads of water, brushed my teeth, and the taste is still there, stronger than before!!
​I know a metallic taste can be a symptom of pregnancy, but has anyone heard of having a salty taste?