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Emergency contraceptive contain higher doses of the same hormones found in regular combined oral contraceptive pills
Depending on the drug, they are for use for up to 107 to 120 hours after unprotected sexual intercourse or contraceptive failure.
There effectiveness is nearly 75%.
As you have your regular period last time, pregnancy
is less likely.
But still i advice you to go for urine pregnancy test, using kit which is available in most of the drug shop. Instruction are provided in the kit. It will be better to use the early morning sample of urine to test.
Urine pregnancy test kit is 98% accurate and should be done at least after week of missed period.
I advice you to do the test and can plan according to the result.
Hope i have cleared you query.