Anyone have a ultrasound early and scared results might be false?!?!

Amanda
My doctor does the gender scan at 16 weeks. We went in for our appointment and we were shown 3 lines and he said it was a girl. Of course doctors can never say it's 100% accurate. I go in for my 20 week scan in two weeks but I'm so afraid that it was false and is really a boy. I've read a few stories where girls were actually boys. This is our 1st so I wouldn't be upset if it's a not but just a little disappointed cause for the past 2 weeks I've been buying pink stuff and just super excited it's a girl. Has this happened to anyone else or am I just worrying too much?!?!