I had a scan today, wasn’t specifically a gender scan but we did ask. The sonographer said she was only 60% sure as one of my twins is 15 + 2 and the other is 14 + 6. She said twin 1 was a boy and 2 a girl. Looking at the screen what we could see matched that. How likely is it that what appears to be a visible boy and girl will change? I don’t know much about nubs so unsure of how they develop.