15 Week gender scan wrong?

MB
Hi ladies! Just quick question about early gender scans and accuracy! My doctors office doesn't do cute 4D or even cute 2D scans for gender! They gave me a card and a coupon for a private sonographer to get it done as soon as 15 weeks in 4D. We decided to get it! I'm 12 weeks today and at the end of the month we go to find out the gender. Has anyone had a different gender between an early gender scan and their later scans? I'm hoping because it's 4D and 15mins we will get a good viewing. I'll be 15+3 when we go. We cannot wait! Just want to know if anyone has experience with early scans being wrong? 

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