First Prenatal Visit HELP!!!

I seriously am only asking for help/answers and ask for no judgement please.. I am 14 & am currently 5 weeks pregnant (today). I haven’t told my mother nor my legal guardian (grandma) & don’t want to just yet. I do know that I need to have a prenatal visit though and am wondering if I need my legal guardian there at all for it. I don’t want my grandma to find out that I even went to the appointment either. I also know that I need to see my OBGYN but I’m not sure if I even have one since I’m only 14. Please help?