Thanks for your reply, IHateFin!
My prolactin is 148 mIU/L (range: 85-500), so it seems to be fine.
I’ve read some of the theories here and there seems to be a connection suggested between high potassium and low progesterone, but my potassium level is 3.9 nmol/L (range: 3.5-5.5), so that...