Even if the woman in question was/is HIV positive, the risk for HIV from giving oral is only theoretical. Oral sex is one of the most common of sexual activities. Receiving oral is absolutely no risk. As for giving oral, your saliva contains over a dozen elements and proteins which very effectively prevent the transmission of viable HIV.
There have been several longterm studies of sero-discordant couples, both gay and straight. They all had lots of mutual oral sex unprotected and only protected vaginal and anal intercourse. The results were that not a single sero-negative partner seroconverted.
So you are worrying needlessly. There's no need for testing. Get on with your life
dont worry, it is not a risk
thank you so much for your help ,i feel much better now .