Hi My periods started on 22nd of July and ended on 26 of July. My cycle goes for 21 days and a times extends to 23 days. I had intercourse on 31st of August but took the emergency contrecpetives before the end of 24 hours. I later had sex on 5th of August but never took the contrecpetives. I do not know between the two dates when I conceived and it is a matter of concern I would like to know if the emergency pills failed or I conceived on a later date Please help