Taking the pill within two to three hours of intercourse is about as fast and effective as emergency contraception gets. Having no symptoms right now doesn't mean anything went wrong, many women get none at all. Your next period may arrive a few days earlier or later than usual, or feel different in flow. None of that alone means the pill failed.
Next Steps
Watch your cycle this month and take a home
pregnancy test if your period is more than seven days late. Keep track of the date so you know when to test.
Health Tips
See a gynaecologist if you get heavy bleeding, severe pain, or no period at all within three weeks.