Levonorgestrel
"My period ended on the first of November. Two days later I had protected sex, but the condom had broke. This was around 7 or 8 o'clock at night. All of the pharmacies were closed so I had to wait. I found Plan B One Step at a local pharmacy and I had taken the pill within 48 hours. Because of the pill I've experienced a lot of irritability. It basically just feels like PMS. Today, 6 days after I took the pill, I noticed light bleeding and I've had a little bit of cramping. "