I dropped with my first pregnancy, a girl, at like 20 weeks, very early and she stayed that way until her birth at 36 weeks but I had that girl, tire around the middle look, well a belly but not that boy swolled a basetball look that I had with my boy.
So sorry for the legs crossed at sex scan, I worked for an ultrasound company while prego with my little guys and I was scanned nearly every day, talk about feeling blessed!