You kind of assume this won't happen, which is silly because of course your children grow up and start their own lives, and sometimes this happens a little earlier than we expect. It isn't an awful thing, it's simply a surprising thing, and sometimes even the nicest and best parents in the world don't know how to respond because we aren't perfect and we sometimes don't remember what it's like being your age. Silly maybe, but it's how it is for many. They will be ok, it will probably take time to sink in as it has for you. But you could do with some support. Especially regarding labour and birth, you WILL need someone by your side. Be it your mother, a sibling or a best friend, it doesn't matter who as long as you trust them and they support you. I couldn't have coped half as good with labour and birth on my own. Truth is, especially the first time, it is scary! I won't lie or sugar coat it for you because there's little point. It's the first time you will go through this and the first time for many experiences is scary, naturally, because you don't know what to expect and it doesn't matter how much reality TV or reading about it you do.
Please tell someone. Get someone to help you tell your family too
I disagree with some of these comments, Happycupcake. She made it clear earlier that she was raped by this boy- this is not an example of her making a deliberate choice, and that her pregnancy is the result of a teenage romance or whatever. But you are absolutely right...she needs to talk to someone, and be seen medically.
To the original poster...you MUST tell your parents. Your grades matter less right now, than telling them what happened to you, and that you're pregnant. You have to make them understand that this boy violated you, and that you've been afraid to tell the truth. Please, please, please do not try to do this on your own - I literally beg of you... Going through your pregnancy without any prenatal care, or without any assistance medically is dangerous for you, and for your unborn child. Your parents will not stop loving you...they will be shocked, yes. The longer you wait, the more complicated this is going to become. Please tell a counselor at school, or someone who can help you break the news, and PLEASE talk to someone about the rape if you can... You do not have to do this alone, or should you! Do not attempt to have this baby on your own. It could very well put your life, and that baby's life in grave danger. You must do something as soon as possible.
We're all here to listen, and to support you. You have done nothing wrong, and school is the least of your worries right now. This isn't going to be easy, but avoiding the issue and hiding it WILL make things 1,000 worse for you and your family in the long run.
Please, do the right thing here, honey. The first step is to break the news to them.