"if you&#039;re here, it means you are scared, anxious &amp; trying to find any kind of clue you will be ok, been there. get away from the internet or you will freak out !. for my experience i have a cycle that can get from 31 to 38 days (35 avg), i had unprotected sex on 07/30, which supposedly it was a day before my ovulation day (period app) but that it&#039;s just an average but still within the fertile timeframe. i took the one dose pill around 10 hrs after sex. only symptoms: nausea, fatigue and mild cramps(for 2 wks!). my period was supposed to come on 8/13, i was freaked out the moment it wasn&#039;t on time, it came 8/14 (day late) with full force cramps. never been happier :)!"