Finding out the Gender too early?

Courtney
I have an ultrasound appointment next Friday (on my birthday) and I'll be 15 weeks 5 days but the doctor says I've been measuring a week sooner every appointment so what do you ladies think I should do? I'm scared I'll go and they will say it's a girl and then find out it's a boy? Should I wait or go for it? I want to know so bad!