There is no fixed time in which one bleeds after taking ipill. Sometimes unexpected bleeding occurs more over it is not necessary. Next menstrual cycle can be early or delayed as side effects of the pill. As she has taken within 24 hrs it is 95% effective
Since i-pill is an authorized emergency contraception measure; therefore it has no long-term or fatal consequence. Nausea, breast tenderness, delayed menstruation, lower abdominal ache, headache, vomiting and irregular menstruation are some of the temporary side-effects of the I -pill. However, these effects subside within a day or two.
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Some women also find that the hormones in the pills can cause unexpected bleeding, but this is not a common or serious side effect. If your next period is late, you might consider getting a pregnancy test. The study also found that the earlier in their cycle women took the pills, the sooner they got their period.