so upset at the ultrasound tech! she told us the sex after we said we did not want to know

We just had our 21 weeks ultrasound and before we started I told her we did not want to know the sex she looked at me and said okay ! I call everyone a he so we were about half way done she had me stop and go to the bathroom we can back and she started to look at the baby again and the. She said it " it's a girl" I was so upset that she told us I stated to cry.. my husband and I have said when we get pregnant we did not want to find out and while I'm happy we have a healthy baby and I'm sad that now the only surprise really ever is taken from us :(