Hey Robyn,
So sorry that is something like this that has you back here at the moment. The chance of another new primary cancer in your 'healthy' breast can vary depending on your original diagnosis and situation.
For me, I have been told that my chance of getting a new cancer in the other breast is about the same as anyone's chance of getting breast cancer in the first place. Also because I am on hormone treatment (Femara now) then this might give me some added protection from another hormone positive cancer.
I had a very similar thing happen on my last mammo/ultrasound. It turned out to be a lymph node (a perfectly normal one) that just had not shown up on my previous scans. But, like you, it sent me into a bit of a panic. They redid the ultrasound and it was all ok.
I hope that your situation is soon resolved without any more worry for you. Let us know how you go. Sending positive thoughts your way. Deanne xxx
PS I bet those grandkids are growing fast. Have you been seeing lots of them?