Ortho Tri Cyclen Lo - Late period, help?

It's probably her body switching to the different hormonone levels... And I was on it for 3 years... I also got my period every Wednesday of the sugar pills... But if I was stressed it would come on Thursday done times Friday and last a day or 2 into the next month of pills.. Butvit can't hurt to have her take a test tovhelp ease your mind... And be safe