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Not to worry. Since you have taken I-pill within 72 hours you should be safe. There will be side effects like early/delayed bleeding which may range from spotting to heavy bleeding. Your cycles should regularise in 2-3 cycles duration. There will also be weight gain, abdominal pain
. Kindly do not take emergency contraceptive pill
whenever you you want. It is best avoided because there are many side effects and hormone disturbance. Use condom or go on the Combined OC pill.