"i&#039;ve always tracked my cycle very closely. this particular night i had unprotected sex i didn&#039;t look at my calendar until after the fact. lo and behold, it was the day of my ovulation! i took the pill exactly 8 1/2 hours after the incident. the first few days i felt no side effects. by day 5 still no side effects but i was a complete anxious mess! day 6 &amp; 7 i felt exhausted, and mild headache mostly due to stress. it&#039;s now day 8 and this morning i woke up with lower back pain, and cramping. i went to the bathroom and my period started! this was the worst week of my life &amp; let me tell you, i have learned my lesson! i feel so thankful. i hope the pill works for you also. sending positive vibes. *hugs*"