My girlfriend is taking birth control pills the ortho trcyclen lo and missed a pill what do we do?

Missed pill: Take the pill that was missed and the one that was regularly scheduled for that day at the same time.(doubling up on your pills that day) then use a backup means of contraception until that period arrives.

Missing a pill: If you forget or miss a pill, don't panic. Simply take an extra pill (the one that you missed) in addition to your regularly scheduled pill (double the dose the next day). You can also use a backup method for a week to be on the safe side.