HI, Thanks for the query. I understand your concern. * Emergency contraceptive pill act by postponing the ovulation. / also making the cervical mucus more thick.. thus not allowing entry of sperm / avoiding penetration of ovum by sperm. For good contraception, emergency pills needs to be consumed within 72 hours of unprotected sex.Earlier it is taken better are the chances of contraception. * Emergency contraceptives cause delay in normal menses by 8-10 days. You have 22 days past the due date of your menses... so I doubt failure of contraception/ Some misunderstanding in taking pills * Pregnancy test by urine test is reliable after 8 days delay in menses. If you have tested it earlier/ or if you have irregular periods.. the result may be wrong.. please repeat it again/ USG should show gestational sac after 5 weeks of pregnancy.you can use the method to confirm/exclude pregnancy. * IN case the pregnancy is excluded.. you need investigations to find cause for delayed period..Consult a gynecologist. * In case pregnancy is confirmed you can get rid of the pregnancy by medicines. ( actually must be removed for fear of fetal anamoly after the contraceptive ) by using MT kit ( containing two types of pills Mifepristine & Misoprostol) under expert guidance of a gynecologist Thanks.