15 week ultrasound. 80-85 % sure of the gender is good right

So technically we didn't find out the gender yet... we had the ultrasound tech write it down on the back of the ultrasound picture. We are going to open tomorrow over dinner together at our favorite restraunt. Im so excited and its taking everything i have not to open the envelope lol. The thing is though is that she said she is 80-85 % sure that this is the gender but because it's early there could be a possibility of something different. I won't be buying anything gender specific until my anatomy scan when im 19 weeks but still 80-85% is still pretty good right ??