Hi my girlfriend has been on ortho tri cyclen lo for 10 months and has gottan her period the 3rd day or the 7 inactive pills every month, this month however we are currently on the 4th day and still nothing. I asked her on a scale of 1-10 what her periods normally feel like and she said for all 10 months its been a 7 and this month its a 3-4 and she keeps saying this month "feels different" I have no clue what she means because she can't explain it. I've been reading with ortho tri - cyclen lo it is very common to miss periods all together but... what still freaks me out is that its been the exact same all 10 months so why is it so different this month??? for my sanity it would be much appreciated if someone could provide some insight on to why this might be happening.