21 weeks and counting

We couldn't be getting any more excited, 21 weeks along now and doing great. Tomorrow is our next ultrasound and who knows what Jack will show us... Hopefully something cute for daddy... It will be fascinating to see how much bigger he is from a month ago, is it true that he doubles in size every 2 weeks ? I can't wait to see him tomorrow, will he be moving around, or sleeping, or sucking his thumb? We'll be sure to write tomrrow and let everyone know