Thank you for your query at DoctorSpring.com
I understand your concern.
Normally if someone gets HIV infection, it is difficult to predict the earliest symptoms. Some patients experience just flu-like symptoms, while some develop enlarged lymph nodes in the neck and other sites of the body. Although the chances of getting HIV is low from one single exposure, it is still better to rule out the infection by 4th generation test. Particularly, considering the symptom if enlarged lymph node, I will appreciate if you get the test done at the earliest and let me know. If it was a protected intercourse then there is nothing to worry about.
Hope this was helpful,
Feel free to discuss further,