You don't need to do anything you just wait for the next cycle. And you should also consult with a gynecologist because it is important to rule out the further pregnancy. And presenting symptoms may be due to hormonal imbalance due to tablet.

Don't worry,the pill has adverse effects , Interference in menstrual cycle is possible So No problem, Take M2 tone 2 tsf bid with water.before meals

It was withdrawal bleeding because of emergency contraceptive pill. The chances of pregnancy are almost nil after withdrawal bleeding. 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