Told boy last week but now girl...

Last week at our 13 wk appt/NT Scan, the u/s tech asked if we would be interested in knowing her gender guess so we agreed and she told us 90% sure boy, but not to go painting the nursery just yet. And she was mainly doing the NT scan , so only looked at one view between the legs. We still felt like 90% was pretty high so started to get boy in our minds. Then this week (14wks), I decided to go to a 3D place to see if they gave a "boy" opinion too, but this lady was determined it's a girl... She looked at many different angles. Curious if this has happened to anyone else and what do you think? We understand now it would have been best to wait til 20 wks but got antsy when the tech said she had a 90% sure guess