I have to go back next Wednesday for a follow up scan. I had one on Monday, but as am only just over 10 weeks they want me back at 12 weeks because they are worried about 2 white areas being picked up on the ultrasound at the top of the baby's head. Has anyone else had experience of this at all and if not should I be worried? I have been told that it could just be where the head is developing. Also does a strong heartbeat give you a clue as to the sex of the baby?