Levonorgestrel
"Back story, I was on the mirena for 5 years and got off of it in Early 2017 (my body has already been used to the hormone in the morning after pill) I had taken the morning after pill about 16 hours after unprotected sex with someone I didn't know. The last 2 weeks of my life have been horrible. I had no initial symptoms of the pill until about a week after taking it. i track my periods using EVE. And it was during my most fertile day that I had sex. Which made me panic 10 times more. I felt sick 24-7. I even threw up. My period came 2 days late. And I'm still on it. It's much lighter than I'm used to and the cramps are horrible. The moral of the story is. Don't panic. Listen to your body. Every thing will be fine. The pill did work."