I'm sorry this happened to you.
If you tested at least a month after you finished your last dose of PEP, you are in the clear for HIV - no further testing needed. If it's any consolation, an event like that is EXTREMELY low risk for HIV.
I'm so sorry that happened to you.
There is no risk from him touching his penis then touching your mouth. Your 14 week test is conclusive.
Are the oral ulcers in the mouth or on your lips? In the mouth, they could be canker sores, which are often caused by stress. Has a doctor seen them?
How long were you on the PEP, and how long after the PEP did you test?