My period is now 9 days late, and I've gained 6 lbs in those nine days, all around stomach. I've peed on stick many times and am not pregnant. I'm getting cramping pains (like period pain) fairly often, feel vaguely nauseous and generally not right. Doctor has suggested scan and bloodwork next week, and a friend has mentioned possibility of ovarian cyst. Anyone had one? Have read that they can interfere with periods and cause sudden weight gain so it kind of fits... Any info/experience gratefully received 