Just talked to my doctor today. Apparently I have what appears to by a cyst, but they're not sure as it's "complex and has 'junk' in it." It is about the size of a grape (which is not what I was feeling--mine felt like a bb). My doc is going to go ahead and send me to a surgeon so it can be biopsied just to be sure. She was okay w/them cancelling the mammo but (I believe) wants a more in depth check and u/s from the surgeons. Doc says the NP in the surgery ward feels basically all the cancerous (and non-cancerous) lumps that come in so she's very skilled.
I will keep you all posted and want to thank you again for your kindness, your advice, support, and warmth!