Oh god I'm so scared

I had some STI tests on Wednesday, the nurse told me they'd phone me if something was wrong or they'd text me back if everything was fine. I have a missed call with no caller ID and I'm frightened as hell.
I'm concerned I have HIV guys
Update: my partner has been getting strange rashes that looks like hives but they only last a couple of hours and he itches badly and gets awful chest pains. Don't know if that's an allergy or something worse...