Swollen Armpit

Hi All: one armpit is swollen and when I touch it I do feel a little lump. It is definitely under the skin and does not appear to be an ingrown hair. Google says it is a swollen lymph node from and infection that your body is fighting. I haven’t had any classic symptoms of being sick with fever, runny nose etc., but one of the reasons could be HIV or cancer. I have an appointment with my ob tomorrow and scared it could be either of those. Anyone experience something like this?