Finding out the gender early...success rate.

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So we had our 13wk scan today and the sonographer said she's pretty sure it's a girl but it's too early for her to say for sure. We really really want a girl & the wait till our 19wk scan to have it confirmed is already killing us! 
So I was wondering if anybody was told the gender this early on & had it turn out to be correct?????
I know that there's always a small chance of it being wrong but at 19wks it's pretty accurate.