Emergency contraceptive pills can shift your next period earlier or later than your typical cycle length, and the bleeding you had from 18 to 22 October was most likely a withdrawal bleed caused by the pill rather than your actual period. Because of that, your real next period could still land close to the end of October or get delayed toward mid-November, and a cycle calendar alone can't predict which this month.
Next Steps
Track your cycle for one more month to see if it settles back into your usual rhythm. If no period shows up within a week of either expected date, take a home
pregnancy test, since emergency contraception isn't completely reliable.
Health Tips
See a gynaecologist if your period doesn't return within 3 to 4 weeks, or if you notice unusual pain or heavy bleeding.