welcome to HealthcareMagic
Nordette is a estrogen progesterone
combinationand is a regular birthcontrol
pill.It is not an emergency contraceptive
and yet is used by few people in high dose like 4 pills with in 120hours as you have said.This may cause excess of hormone and can act like an emergency contraception
but it is harmful.If you are married and do not want to have kid immediately please use Nordette 21
regularly ;this will help you in contraception as well as will not disturb your periods or cause problems.
Be safe and use medicines judiciously and under guidance of a doctor for a healthy life.