Taking the i-pill (levonorgestrel) can disrupt your hormonal cycle, commonly delaying your period by a few days to a week. While a 15-day delay can happen due to these hormonal shifts, it is also important to rule out pregnancy, as emergency contraception is not 100% effective. I gently recommend taking a home pregnancy test to get a clear answer. If it is negative, your period should return once your hormones balance out. If you experience severe pain or the delay persists, please consult a doctor for personalized care and reassurance.