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the emergency contraception pills
are effcient when taken within 24 hours or 48 hours and 72 hours. efficiency decreases as it gets longer. In your case it could be efficient but there is no surety. I would advise you to calculate initially whether it you are in your safeperiod.. If you are in your safeperiod You do not need to worry about pregnancy. the chances would be very low.
you can visit your gynecologist
and get an IUD
inserted , as it would work as an emergency contraception and also regular contraception. Please follow your safe period And barrier method
like condom to avoid pregnancy.