I am 20 yo female I have recently starts taking metromin for a little shy of a month to treat pre diabetes my periods usually come like clock work and this month my period was later than usually and basically just spotting I have taken two pregnancy tests that both say neg I have recently up my dosage of the 500mg XR metromin to 2 pills a day I am getting very bad cramping tonight and do not know what it's from so bad I cannot sleep help?!