Possible std??

I went to the ER for a blood clot and bad cramps and they ended up basically saying I could possibly have an std. Neither myself or my partner have been with anybody else. Nor do I have any symptoms whatsoever, everything is normal. They tested me and started me on antibiotics just to be safe. My results should be in by the weekend but I am completely freaking out and don't know what to do. I cant even eat because I'm so scared