Could sonagram be wrong @ 20 weeks pregnant?
Sometimes the boy parts don’t descend until 22 or 23 weeks. Did the ultrasound tech say he/she saw the three lines? Girl bits look like, well, like this (l), and boys like a rocket ship. P.S. Nobody told me this, but if you are having a girl the bits are very very swollen at birth and she could get a mini period. (scared the hell out of me!) Take care, and good luck!