Levonorgestrel
"I had sex with my boyfriend for the first time on November 28 around 10:30 at night, I wasn't able to buy plan b until the following Tuesday which was about 63 hours later, it is now 6 days later and my period isn't supposed to come in until 3 more days, but I have to say, so far it's been a miserable experience. I've had extreme cramps and bloating and a little bit of constipation. I don't know if it's from me stressing out so much or it's still from the side effects. Hopefully this works."