You should first go in for a pregnancy
test (urine) to know if you are pregnant.
Some amount of bleeding should occur after taking the pill.
Important- the emergency contraceptive
pills are supposed to be taken in acute emergencies only and are not for use off and on.these were first designed for rape victims but due to easy availabilty in the market they have been and are widely misused.
The frequent usage of these pills can lead to disturbed menstrual cycles and even permanently stop your menses as these contain very high dosage of hormones.
U advice you to visit your doctor and get your tests done.