Yes, going back on the pill would effect your supply. You may want to try progesterone cream instead, I used it when nursing my daughter it is very subtle and didn't seem to affect my supply no more so than the affect your period has on your supply. I used emerita progesterone cream about 1/4 teaspoon on my forearms daily. I read the book by Dr. John Lee "What your Doctor May NOT tell you about Pre-menopause" And he suggested the cream. I currently take B-6 supplements to help with progesterone production and that seems to take care of many of my symptoms. I am taking 50mg once daily. Hope that helps.