Growth Scans

Hi ladies, I just went in for a growth scan at 23 weeks.  Baby B is measuring 23 weeks exactly. Baby A is measuring 24 weeks and 2 days, 9 days ahead of B. Doc said its nothing to worry about, but I'm curious to see if any of you other ladies have had this during your growth scans?  Good news is they are both on track.  Since we're waiting to find out the genders I'm secretly hoping A is a husky boy and B is a petite girl :) :).