I had heavy, 7-day-long periods with several clots, nausea, severe cramping,
and severe lower
back pain before going on the pill but now have light to moderate 2-3 day long periods with few clots if any. It is most effective if you take it at the same time daily, so I set my alarm on my cell phone to go off daily at the same time. If you start experiencing nausea while taking it, changing the time can work in some cases.