I am a 38 year old woman with a fairly regular cycle. My last period began on 10/12, and I had an accident on 10/19 potentially causing some sperm to enter me. I waited to take Plan B (stupidly) until 10/23 as a last ditch effort to prevent a pregnancy. (I know it's most effective up to 72 hrs, but read it will sometimes work up to five days. I believe ovulation was due 10/24-10/26, and am hoping it worked. Any thoughts are appreciated as I'm extremely anxious. My cycle is normally 26-27 days.