Which pill to use to do abrtion when the prengency of 3 months?

bad bad idea unless you go to a doctor an obtain a medical abortion. That's the only safe way. And a total mythbuster....taking a lot of Birth Control pills or the morning after pill will NOT cause you to have an abortion.

Talk to your doctor

Just want to second the response of the poster above. Multiple birth control/Plan B will only make the environment hostile to conception. If you are pregnant, you will stay pregnant. It is not known for sure if hormones such as estrogen or progestin will cause birth defects, but you run the risk of that if taking multiple doses at once while pregnant.