Should Emergency Contraceptive Pill Be Taken To Avoid Pregnancy?

Hi doc,

17th June was teh first day of my periods, I started with Birth control pill from 18th June but it dint suit me as I was having moodswings etc so I stopped it on 25th June & on 27th June I had unprotected sex with my hisband & on 29th June thats today I got brown spotting & cramps, fatigue etc.

I am too scared & we are not planning for pregnancy so soon. Can u please suggest if I shud take emergency pill which lasts until 72hrs of unprotected sex??