Over the past few months (five times from July thru September), I have been with a lady who is more of a prostitute than a massage therapist (as I first thought). The last time was at the end of September. I kinda knew she was more but I didn't realize how risky she was. I didn't think she engaged in intercourse with her clients. I learned differently. Even though I only had fellatio (oral) with her and once or twice performed oral on her, I think she had unprotected sex with a number of guys.
Now she has informed her "clients" that she has tested positive for HIV. Since it was on a forum, I have to assume that it is real although I have some doubt.
Assuming it is real and I have had five massage sessions ending with fellatio, should I be extremely worried, somewhat worried, slightly worried, or not very worried at all? I have read that oral is low risk for HIV, but how low?
Should I get tested immediately? How often should I get tested?