Bi Girl Sex Concerns

okay ladies... so at a new year's party last night, i gave a girl oral for the first time. this was my first sexual encounter ever, and I have a few medical concerns. Can you get STD's from giving oral, even if you're sure she doesn't/didn't have anything? i just turned 17, and i just went to the doctor a week ago... help me! what do i do? i'm slightly anxious over this.