Can I Take Emergency Pills After Stopping Norethisterone, Following Unprotected Sex With My Husband?

Hi, I am having period on 4-11th March and it stopped, and have it again on 16-21March. And I am afraid of getting period because I am on vacation, so I took Norethisterone twice per day from 28th March to 5th April, and I had unprotected sex with my husband. Can I still take emergency pills after I stop Norethisterone?