Gender Question!!

Brittany
I am 13 weeks and 4 days and went in to get an ultrasound today. I asked the tech if it was possible to find out the gender. She informed me as long as baby cooperated we may see. My family only has girls so I've assumed this entire time I was having another girl. She told me well I think that's going to change and said she was pretty sure that I was having a boy. I'm just worried about getting excited about the possibility of thinking I'm having a boy and it's really a girl. Has anyone else found out on an earlier ultrasound and it be right? Thanks in advance!!!