For the past two weeks I have had two canker sores on both sides of my cheek and the tip and sides of my tongue and now I have a pretty painful canker sore on the bottom of my gum. What is going on with my mouth, my school nurse just told me it happens from time to time. I am really freaking out because I read online that mouth ulcers/canker sores it could be a sign of an HIV infection. I had what I thought was protected sex a few weeks ago, condom did not break, but it was on sort of sloppy, urethra was def protected. I have had no fever, is this an ars reaction?