Hello- first time using this I went off the pill after 5 years in October and had no period. The doc put me on 100 mg of prometrium for 14 days and period started immediately. So then the doc told me to start the prometrium the next cycle on day 15 and take it for 14 days, but I started having bad side effects so she told me to stop taking it after only 5 days (day 21 of my cycle). Now I'm having some heavy spotting and the doc office can't explain why OR why I had side effects the second time but not the first. Any ideas- I'm so frustrated

Thanks!!