Are there any pills that may stop the pregnancy if so what is is called?

There is a pill called the day after pill. You can take it up to 5 days after you had sex. If the sperm has already reached the egg, it won't do anything. The pill prevents you from getting pregnant, but it won't stop you from being pregnant if you are already pregnant. The only thing you can do to stop the pregnancy while you are pregnant is to get an abortion.