Freaking out ultra sound and mammogram today ..

Today I had an ultrasound to check on a lump of scar tissue in the surgery site of my lumpectomy I had over 2 years ago. The radiologist came in to tell me nothing else showed up in either breasts phew ....however one lymph node shows vascularity around it .I asked what size it was knowing normal size is 1 cm. She said it is within normal size but since the last ultrasound it has vascularity. She wanted to do a needle biopsy then and there. I declined because Id rather speak to my own oncologist in 2 weeks first. ...I did agree to a mammogram which I  do not  like having but I did as she explained it would show up more. All sorts of fear is bubbling up and I'm trying to stop it .I have had scans 2 months ago and no active cancer apparently. Can anyone tell me if this could be Ok? I'm on herceptin and perjeta forever I guess and it has worked well  so far and I didn't have any lymph nodes taken at surgery .I didn't wish to do that  My bloods last week were perfect . But ...still what does this mean . I haven't had any infections that I know of either...