Hi I., there are just a couple of things I want to say.
1.) A couple of posters advised you to get an IUD and while I love my Paraguard copper IUD, you need to understand that you can't get an IUD until you've had at least one child. I think maybe you were intimating that you don't have any children yet and if that is the case, then an IUD is not for you yet, although I would highly recommend one for the future after you've had children.
2.) If you don't have much information about the world of sex and parenting, definitely go to Planned Parenthood (I also do not agree with their stance on abortion, but the information on STDs and Pregnancy/preg. prevention they offer is invaluable). They have tons of educational programs and lots of handouts you can take with you. However, go BEFORE you have sex again. Sex is a wonderful experience, if enjoyed responsibly, and you cannot be responsible about something if you are uneducated about it. Please, please, please get educated first. It may be the most important thing you ever do. Sex has the potential to radically alter your life and if you're smart that's not something you just jump into with any information. If you're being pressured by a boyfriend, just tell him that it's your body and your life and you will not take any risks with them as they are the most precious things you have. If he doesn't like that, then too bad.
3.) Try to imagine the daughter you may someday have, and then ask yourself if you'd want her engaging in sex without any knowledge of the consequences or how to prevent them. It's sometimes hard for us to see when we're not doing something smart, but I've found that this projective trick has worked for me in the past to help me see when I may be behaving in an irresponsible fahion.
Best of luck to you in your future. Thank you for being smart enough to think about all of this BEFORE you accidentally got pregnant.