Wrong gender at 15 weeks?

I had an emergency sono today due to bleeding. Baby is fine, I just have some cysts!

But the sono lady kinda looked and asked what I thought, I said girl just because I already have 2 girls. But really this whole pregnancy I’ve thought boy because it’s sooo different from my others. Anyways she looks and looks and says baby is being difficult plus it’s still early. But she thinks I’m right that it’s a girl. And she just doesn’t see a scrotum.

My question is, has anyone been told girl but later it was a boy? It just doesn’t feel like a girl!