Couldn't tell gender of the baby

Constance • Updated: my daughter is now almost 7 months old and I'm no longer a single mother. Me and her father got back together
My baby kept his/her legs closed the entire time! Technician tried to get baby to open the legs by jiggling tummy, me moving to my side,etc. baby was being so stubborn! After 15 mins she gave up. I'm so sad!  Has anyone else had this problem? What did you do?