"had sex on the 7th of august. took plan b about 23 hours after from the intercourse. haven&#039;t gotten my period yet because i&#039;m not supposed to be due until the 20th of august but a major side effect that i&#039;ve been experiencing is a major amount of tiredness and exhaustion! when i got home from work the day after i took the pill, i went upstairs around 9pm to sleep and woke up the next day around 1pm. i wake up extremely exhausted and my feet start to get tired as well. also i barely ever hungry anymore... i&#039;m 18 years old so this is very unusual for a teen... hopefully my period comes soon."