Unwanted 72 contains a hormone called Levonorgestrel, which can temporarily affect your menstrual cycle. The timing and amount of bleeding may vary from person to person depending on factors like individual hormonal response and the timing of taking the tablet. Some people may notice light spotting or bleeding within a few days, while others may only get their next period, which may come earlier or later than usual and can be lighter or heavier. However, very heavy bleeding is not a common effect of Unwanted 72. If you experience unusually heavy bleeding, severe abdominal pain, dizziness, fainting, or need to change a pad every hour, seek medical advice. If your period is delayed by more than 1 week or bleeding continues, consult a gynecologist.