My last mens was jan 20, i had sex last feb 13, and took nordette as ecp on feb 15, i been used it before and im sure that is 100% effective. But now, am 4 days late on my period this month. Im a 28 cycle girl, and it says that on feb 13 am safe, but to make sure i took ecp. What should i do now? Still very paranoid. Still no have bleeding.