Anxiety over sexual problem

So apparently, I've had cold all my life and apparently 2 months back,I lost my virginity for the first time to a guy. What I'm worried is just in case I've got STD or not cause I feel like there are some small red sore-like thing in my throat which is apparently causing me trouble. I did HIV test and all and it came negative. The general physician of our family gave me meds and I'm better but I'm still worried if it at all is related because of swallowing semen. Was it a bad idea? Is it some allergy?