Hello Alayna and welcome to HCM
AS per you mail you are not sure either for breast nodule nor for axillary lymph
node whether they are present or not and also you have no symptoms.
In my opinion you to go for an another USG as advised and confirm if lymph node is present or not.
If you feel some problem than get it examined earlier.
Enlargement of the lymph node may be due to infection like bacterial or viral, TB and may be malignant. To be confirmed by FNAC.
Wait for your second report and than consult your doctor again.