They found two nodules in my thyroid gland?

they are both less than one centimeter each, so the endocrinologist does not want to do a biopsy just more blood work and he said he wants to keep an eye on them to make sure they do not grow because they can become cancer. My concern if they are two, he does not know what it is, why wait six months, can it spread? My brother has Lupus, I have high blood pressure, they remove my gall bladder in august, my liver enzymes are high. any suggestions. Thank you