thank you for using health care magic,
i understand your consern,
chances of spreading HIV by oral sex
is rare .. from protected vaginal sex also HIV can spread but chances are less..
Spread of hiv totally depends on your partners's hiv status.. if your partner is known person try to find out your partner's hiv status.. go for confirmatory hiv test
P24 antigen..if it is negative no need to worry..
node is not very early symptom of hiv, it can be because of some other reason.. consult near by physician ..