No, you shouldn't be worried. Worry is making your throat feel sore.
That's my best guess, in any case. You should see an STD specialist and be evaluated for all of them, including HIV. Since HIV conversion can take up to 6 months, you might have to repeat the test, but the sooner you go, the faster you can stop worrying. And you may have a viral or perhaps bacterial or allergic sore throat which can be treated.
In the future, of course, you'll be more careful . . .
Dr. Rockoff