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Basically even with UNPROTECTED vaginal sex, the chance of becoming infected after a single exposure to a HIV-INFECTED person is relatively low and is 0.12% per coital act. You have a much lower risk in your case.
The risk is even lower with oral sex. Though no one knows exactly what the degree of risk of oral sex with a HIV infected partner is, evidence suggests that the risk is less than that of unprotected vaginal sex. The risk is estimated to be less than 0.005% for the person performing the oral sex. And for the person receiving it, the risk is estimated to be even lower.
Hence though the risk is very very low in your case, but it is still not zero and if you are concerned then you can get tested. Also The Center for Disease Control and Prevention (CDC) recommends that all persons aged 13 to 64 be tested for HIV at least once even without any history of exposure.
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