16 week ultrasound

Hi ladies w went for a 16 week ultrasound today at mfm and I was shocked too hear that we're having a girl. After 4 boys this came as a shock. But she said not to paint the nursery just yet, but seemed really sure it was a girl, she even showed me the three lines. How many of you had the correct gender given at 16 weeks? We're going back at 19 weeks and I'm hoping a penis dosent appear, lol.