Help plz

I have yellow discharge have had it for awhile. It had a weird smell to it and I’ve been checked for the common std and they said I didn’t have any but I’ve been having sex a lot more recently. So should I go get tested again? My only concern is that I’m 17 and my mom doesn’t know that I’ve been having sex and I don’t know how to get an appointment without telling her why and without her finding out.

UPDATE 8/21

it was bv and I’m on antibiotics. They also tested me for stds so that’ll come back in a few days. Doctor said he doesn’t think I have an STD though. So I’m glad.