I just found out two weeks ago that I'm pregnant. where I like there are lots of free pregnancy clinics to help me until I can get to an obgyn and as well as after with classes, free diapers, free carseat, free maternity clothes, ect. the sooner you can get in to a place like this or an obgyn and find out how far along, the better for you and the baby.
Make an appt to see an OBGYN. Write a list of questions to ask while there. Buy some prenatal vitamins, maybe buy the book What to Expect while Expecting.
Don't be afraid to ask questions. Hopefully you can find a real life friend who can help you out too. Do you have a mom or sister?
Don't worry. Congratulations.