No, oral sex is not a risk for HIV. Given the studies that have been done, which you may choose or choose not to explore for yourself, you will find that oral sex is not really a risk for HIV at all. I will not quote the statistics or the studies as I will choose to believe you may have researched this yourself. If not, feel free to PM me and I will provide links to the relevant reading material.
Basing from your description, your encounter did not put you at risk for HIV infection.