First of all, your probably not even pregnant. How late is your period? If you had unprotected sex within a 72 hour period you can buy the morning after pill or Plan B. This must be taken within 72 hours. This pill does not cause an abortion nor is it used for birth control. It just prevent's the egg from attaching itself and it will bring on your period, providing you are NOT pregnant already. Remember it will not cause you to miscarry.
If you are late with your period you may want to take a pregnancy test. You CAN NOT do an abortion at home. It is a very dangerous and un sanitary procedure if it's not done by a trained professional in a clinic or hospital setting. You could die if you attempt anything on your own. If you are going to continue to mess around with no protection, you are asking for your own trouble. Look into getting on some birth control. Planned Parenthood is an excellent place to go. They can determine if you are pregnant and they perform abortion's as well. Look up Planned Parenthood in your phone book and call. Ask to speak with a nurse or a counselor as they are very helpful and understanding.