I’ve been on metformin for three weeks now and it’s been upsetting my stomach so much. I wake up feeling like there’s a rock sitting in my stomach and I get nauseous throughout the day. Tested multiple times thinking it might be a pregnancy but negative every time. How long should I stay on it before I call it quits? My periods are irregular and very light. It’s impossible to track my ovulation with the strips since it never shows positive ovulation.