Good luck with the appointment Tiff!
I swear, I sometimes hate being a SN mom. It has me all paranoid about A. She rolled belly to back a handful of times at 4 months old, but NOTHING in almost 2 months. She won't roll onto her stomach and if you place her on her stomach, she just screams bloody freaking murder, and the longer you leave her, the louder she gets and the harder she cries. She won't try to roll AT ALL or move AT ALL. She can sit unaided for 20-30 minutes at a time, and seems to have hit every other milestone, with the exception of passing an object from one hand to another.
Someone tell me I'm just paranoid.