Levonorgestrel
"Our condom seemed to not have worked properly, but I had to work so I didn't take the pill until about 18 hours later. I have taken the two pill process about a year ago when the same had happened, and I didn't become pregnant then nor experience side effects that were noticeable. With this pill, I have been tired, but I am a teacher who works long hours and grades late into the evening so I didn't attribute it to the pill. I was not nauseated but took it a couple of hours before bed and was my usual tired self. My period came 5 days later with a vengance (strong cramps/heavier bleeding). It is 2 weeks early, which scared me a bit. That is why I wrote this review and sought out others. I also experienced diarrhea due to cramps being so strong."