Ultrasound

I went for an ultrasound with FNA today. The radiologist said he thought my main lump was a blood filled cyst however noticed a lump on my lymph node on the left hand side that was just over the threshold. He decided that we would leave the biopsy for now and see if it grows over the next 6 weeks but I will hear more from my endocrinologist in the next week. Is this a common occurrence to leave it again? Or will my endo say I will need the biopsy when we discuss my results. Feeling a bit confused 🥴