Welcome back to the Forum. this question is VERY similar to the last question you asked here. Rather than repeat what Dr. Handsfield told you, I have posted a link to his earlier response to you. No part of the answer has changed except that 2 more months have passed in which there is to scientific evidence that HIV is spread through oral sex. You do not need to worry, either about giving or receiving oral sex.
http://www.medhelp.org/posts/HIV-Prevention/RISKS-AND-SYMPTOMS/show/1460149?personal_page_id=1265346#post_6643917
Einstein once said that one definition of insanity is to do the same thing again and again and to expect a different outcome. Your canker sore and sore mouth are coincidental. I urge you not to worry. There is no need for concern or for testing. EWH