Hi , My last period was on Oct .2,Me and my boyfriend had sex on Oct.13 12:00mn , It was a unprotected sex . so take a nordette as a an ECP , i take nordette on Oct.16 , 7:30am 4pills after 12 hrs i took nordette . Why until now Oct 21 , there is no withdrawal bleeding , i am so worried , Is there a possibility that i am pregnant ? Help me please ..