What's within Plan B???
Answers: It is essentially like taking 5 or 6 birth control pills because it have the same hormones (progestin and estrogen), they are just within higher, more concentrated doses.
Within 72 hours after sex, the sperm is still moving up the fallopian tube, it is not immediate conception resembling most people think. Progestin prevents the sperm from reaching the egg and keep a fertilized egg from attaching to the wall of the uterus (implantation). Estrogen stops the ovaries from releasing eggs (ovulation) that can be fertilized by sperm.
If you take this, take the daylight off work as you will likely be sick and miserable, I know I be the two times I had to take it.
Hope I help.
.
levonorgestrel