Morning after pill

Hi guys, I had unprotected sex a week or so a go but I'm on the pill, I took the morning after pill just as an extra precaution as I was overseas and forgot to take my pill earlier in the week I had sex for one or two days because of travel, I did however make up for those days! I took the morning after on Sunday that just went by and my period was supposed to be due like two days after that but it hasn't come yet, I'm guessing that might be because of the morning after pill? Is it normal for the morning after to delay your period? Just wondering as its my first time taking it 
Thanks guys!