"i&#039;ve started using tri-nessa in order to skip my period -which is supposed to happen while i&#039;m on my caribbean vacation.  i usually have a period that lasts 7 days.  just last month, while on tri-nessa, i had a period that lasted two entire weeks!!  and i didn&#039;t miss one pill!  i&#039;m terribly worried that the same thing is going to happen this month.  by the way, i never had this problem with ortho-tricyclen."