How long do STD test results take to come back?

The OB told me that if anything came up on my test that he would give me a call and that if nothing showed up on it that he would just tell me at my next visit. It’s been 4 days and no call but I’m still having anxiety about it because I have anxiety about everything

Edit: I have no symptoms, it was just a routine thing. I’ve only been with 2 people in the last 6 years so he said I was low risk.