emergency contraception
"Does it work? Yes. Will you experience side effects? Probably. 

Took the pill 36 hours after having unprotected sex. Started feeling side effects about 24 hours after taking it. Started my period 5 days later (10 days before period was supposed to start). Had absolutely horrible PMS. It made me super depressed and anxious. However, it worked. I  plan on using other forms of contraception in the future, because this past week was awful."