Complex renal cyst that was a simple cyst

Got my 2nd ultrasound. I have a 6 mm stone obstructing and mild kidney swelling (same as previous ultrasound a month ago). BUT my concern is now the cyst on my other kidney, which has been described as simple on prior CT and u/s is now described as: “There is a solitary complex cortical cyst in the inferior pole measuring 2.7 x 1.9 x 2.1 cm. Internally it was anechoic, with smooth margins, septation, with no calcification and no internal vascularity.”

Can’t see dr for a week but super concerned.