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I advice you not to take this medicines by yourself without the supervision of doctor. They have their own side effects.
After emergency contraception
, usually you will have bleeding on the same date of your period may be +/ - 2 to 3 days. They are nearly 80 to 84 % effective.
I advice you wait for another 4 to 5 days and if your period will not start, i advice you for urine pregnancy
test, using the kit which is available in most of the drug store.
Depending on the result you can take the suitable step.
Hope i have provided the information you needed.