Ok, Lets see. When I started they didn't occur but every 6 months or so. Then I had some that lasted for around 4 months (without stopping... it was small amounts everyday, but still. and there would be like 1-3 months in between series...) Then I had one that lasted 3 days But I was bleeding so much I went to the ER. (They sent me home, but told me to come back if it didn't stop) then I had another one that was lasting for a while so I went to my regular Dr....and she put me on low dose birth control pills to regulate them.