How do you tell your parents that your girlfriend is pregnant?

Don't say, "well you shouldn't have sex anyways." -____-

I have no personal experience with this, but I can tell you it's better that they hear it from you -- and soon -- rather than hearing it from someone else.

Here is some info I found:
http://kidshealth.org/teen/your_mind/Parents/tell_parents.html

Also, here's a link that has online counselors available via chat:
http://www.plannedparenthood.org/info-for-teens/pregnancy/im-pregnant-now-what-33830.asp
The chat option is in the big green box. Someone can chat with you when there's a counselor online.

Assuming you're the father, subtract your age from your parents ages. The more difference there is, the more upset they will likely be and the more time they will need to accept the news. Give them that time and they'll deal with it and participate. Most important, accept responsibility for your part and stand with your girlfriend, whatever the consequences.

Just tell them, because they is nothing else you can do.
Be true and honest.
I am not trying to sound mean, but if you were man enough to have sex.
Be man enough to take what ever happens.
Be a "MAN/honest" if you wasn't ready to be a "Man" Should have never had sex. Sorry, but good luck