Very unhappy SO 😔

We went to go find out the gender of the baby today. I'm 14w6d. Even though the ultrasound tech said the umbilical chord was in the way, and that the babies legs were closed...she thought it was a girl. We're going back on Friday to try to verify....but here's the issue....we have three girls already.... and my SO is INCREDIBLY upset. He wanted a boy so bad, and I wanted one for him because I knew how disappointed he would be.  I tried to tell him to be possitive because we don't know for sure yet...but what do I say if we do end up confirming it's a girl? He does NOT want a girl. 😔. I want a boy too, but I wouldn't complain with a girl.... it took us 3 years to get pregnant...Â