Hi,
I just switched from Loestrin 24 birth control pill to Beyaz which has a different formulation of progesterone-- 3Xs as much as my old pills-- and my GERD problems went through the roof within three days. Progesterone is the culprit for heartburn during pregnancy (it relaxes the stomach valve leading into your esophagus), so I would definitely advise female GERD sufferers to be alert to the active hormone levels in their birth control. In my case, I don't think it's the root cause of my problems, but it definitely increases the severity of suffering ten-fold. I'm switching to another low progesterone pill ASAP!
GC