 [ Symptoms ] had unprotected sex feb 8 and i took nordette pills as ecp on feb 11 will it still work my most fertile day was feb 10 by the way i have a regular cycle [ Disease ] hi as nordette ecp has a range of 120 hours i think you should be on the safe side of not being pregnant so in the next two days you should start a period and this will be from when your periods will now start this is what it does ok good luck