"i had unprotected sex without realising it was the day that i was ovulating and took the pill within 17 hours. i experienced horrible stomach cramps, nausea and lower back pain but no period for 8 days and started to get really worried! i was convinced i was pregnant and kept looking at forums for information on pregnancy symptoms and implementation bleeding. luckily on the 9th day i was very relieved to see i had started my period and i was having sleepless nights for nothing. it&#039;s an excruciatingly long wait but it&#039;s worth it so just hang in there. it definitely works, it may just take a while!"