help me out??

so i’ve been with this girl for about a year now, and now things aren’t right. I’m itchy, it feels like i’m burning almost constantly, and having discharge that sometimes looks like orange-ish?

my girlfriend is my first, but i am not hers, and while she says she doesn’t have anything, she’s never been tested. i trust her, but i know that some people don’t get symptoms..

could it be a std? because again, we’ve been together for a year and i’ve never noticed anything before.

i do have a appointment at my city’s planned parenthood to check up, but that’s friday, so until then, any advice?

also, this is my first time going into a appointment like this, so if anyone has any advice about that, please help me out. i’m honestly so stressed and scared.