Lutera is a combined OCP and has effectiveness more than 99%. Pregnancy
depends on two factor like failure of OCP and breaking of condom around ovulation time. Though chance is very minimal.
You do a home pregnancy test to exclude pregnancy, if you do not get period after completion of placebo pill.
In case of negative test, reasons for delayed period are hormonal
problem, wt gain/extreme loss,irregular eating habits etc.
Need to investigate properly to rule out underlying pathology by USG lower abdomen, Thyroid profile, LH/FSH etc. So consult with your doctor and take suggestive measure.
Avoid stress, take healthy diet and practice safe sex in future. Be well.