This just in....we saw girl parts on Unicorn's ultrasound yesterday!
(My husband is prescient--he had already bought a fuzzy lavender stuffed unicorn for the baby the night before.)
She appears to be perfectly healthy despite my "advanced maternal age," so we're quite happy. We were also suprised and relieved to see her stick her tongue out at us, which means that she almost certainly isn't tongue-tied (a condition called ankyloglossia) like Griffin was. Whew!