Help!!!

Ok so Thursday was the first time I went out. I got drunk and I was at a clubs and went to the bathroom. There was no tissue. And I look on the sink and the cardboard piece from the tissue was there. So I used it and put it in the trash. I have bad anxiety and now I’m thinking someone else may have used it and I could have an STD. I want to get tested but is there a waiting period? Idk I’m just confused does anybody have any advice 😕😕😕