Frequent or irregular taking of Nordette pill may cause delayed or irregular period. I suggest you to undergo one home pregnancy
test 2 weeks after last sexual intercourse. It helps to clear doubt about pregnancy.
After that, you must consult with doctor for other relevant investigations like ultrasound
scan, hormone test etc. Combined hormonal
pill or regular pill is the best choice of contraception
to prevent pregnancy (99.9%) and regularize period. Kindly, consult with doctor for complete prescription.