Have you taken a pregnancy test? Are you absolutely sure you are pregnant and maybe not just late on your period?
In any case, especially due to your age, you need to go to a doctor as soon as possible to find out how far along you are and do all the basic pregnancy things every pregnant woman needs to do.
Have you told your mom yet? That is going to need to be done as soon as you can do it because being an adult starts right now - and you are going to need all the support you can get!