That being said, I had to do some extra research and found some answers on another website. Here is the paragraph I think they should have on the commercial:
How does Plan B One-Step work?
Plan B One-Step is one pill with levonorgestrel, a hormone that has been used in many birth control pills for over 35 years. Plan B One-Step contains higher dose of levonorgestrel than pills, but works similar way to prevent pregnancy. It works mainly by stopping the release an egg from the ovary. It is possible that Plan B One-Step may also work preventing fertilization of an egg (the uniting of sperm with the egg) or by preventing attachment (implantation) to the uterus (womb).
And here is what I found earlier in that website:
Plan B One-Step will not work if you are already pregnant and will not affect an existing pregnancy.
I am not the best at science but here is a short lesson for everyone out there.
Step one: egg is fertilized
Step two: zygote (aka your baby) travels down fallopian tube for around a week
Step three: rapidly growing baby implants in the uterus to receive much needed nutrients.
If you take "plan b" less than a week after sex as directed there is no way it could cause a miscarriage from the uterus - the baby hasn't gotten that far yet. It can cause an existing pregnancy to fail because once the egg if fertilized all the DNA is there. In any case, I think that fact that the drug company does not explain how it works on even their website is dishonest and all women should learn a little more about how their reproductive system works before loading their bodies with hormones.
Unfortunately, many doctors, teachers and parents are not helping girls learn the right information. Many don't have it themselves. As a woman that has taken a lot of time trying to figure out what is happening in my body, I hope and pray that I am helping others by finding some sources that explain and reveal what doctors, pharmacists and commercials won't.