Hello Thanks for writing to us with your health concern. THe I pill is known for altering the normal pattern of your menstrual cycle. It can prepone or postpone your expected cycles by upto a week. But this affect generally does not persist beyond a month. What you are experiencing this month is probably not related to the I pill. Make sure that pregnancy is conclusively ruled out. ALso, stress, anxiety, emotional turbulence, weight gain, hypothyroidism, polycystic ovarian disease, change in sleep or diet habits - all these can cause a skipped period, apart from pregnancy. If you do not menstruate within a week more, and pregnancy is ruled out, then you would require a gynecological evaluation to know the cause. Take care.