As any doctor..this is my 3rd child and I was anxious as you but my doctor explained that its not 100% accurate...I am not going to go back and fourth with you.
@babyhinojosa16, I went at 14 weeks not many places do before that. You can definitely go it they take you. But the baby parts aren't completely developed. The female parts might look like a male..until the baby gets bigger. It's accurate more less when its around 17+ weeks.
my friend found out she was having a girl at 13 weeks....and they were correct... I went in for mine at 14 weeks they really couldn't tell but they thought it looked like a girl. and they were correct I'm having a girl I'm 28 weeks now