Re: microcalcification now found in thyroid nodule
I don't think you can determine malignancy based upon ultrasound at all.But you can detect changes in size and type, and it's very good you've been following the nodule.
If the ultrasound indicates any changes, then you should probably have an FNA to see if you can get any cells and more information. It's certainly possible to have a calcified nodule that is benign, that's why an ultrasound is not a definitive test, just one of many to help you decide if you need surgery.
Anything you read on the internet, focuses on cancer, so my advice, until you see a doctor and determine your next step, is to not read so much internet stuff that you upset yourself. Most nodules are benign.
Let us know what the doctor says, and in the meantime, I hope you enjoy your weekend and not to worry too much.