The United States legalized abortion in 1973 (Roe vs Wade Supreme Court Decision), but eventually, it will be your decision. Your conscience will dictate. In other countries, abortion in any form or reason, is illegal.
Please don't. It's legal, but think -- what happened to you isn't the child's fault, and there are many, many people who would love to have children but can't. Please, put the baby up for adoption rather than kill it. It's terrible to have your body violated, but please, please, don't kill the child. It deserves a chance at life, whatever the circumstances of its conception.