My mom had an ultrasound two weeks before my little sister was born and they told her it was a boy. When she was born out popped a girl, my mom was so mad she had all boy stuff
My friend and her sister were both supposed to be boys. Their mom told me she didn't know it was a girl until they both came out and there was a hoo ha where the penis should have been lol. My husbands cousin was a girl until he was born and the doctor realized they were wrong. I heard it happen s a lot actually
My Tia (aunt) was told my cousin would be a girl it was not untell birth she found out "she" was a "he" lol sometime there legs get in the way to tell, have you done 3D sonogram? You might be able to see more clear girl or boy