I have been taking Metformin for 4 weeks. Started one pill a day for a week, then two, then three. For the past week I have been taking 2 in the morning and 2 with dinner. I have had some diarrhea, but not two bad. My period started on Monday. Tuesday and Wednesday, I have had pain in my stomach (above my belly button and 2" higher). Feel almost like contractions. Feels a little better if I sit still (does not completely stop), but if I walk around it gets stronger. I called the doctors office and was told to ask the pharmacist. Pharmacist said it could be the medication and did not recommend to change anything. I did not call the doctor back.