Wrong gender sonogram

Monica
Is anyone in here worried that you received the wrong gender at your 20 week scan? I already have a son and it would mean the world to me to have the girl they say I'm having but I just feel like it could be too good to be true. And I feel like baby was moving a ton and it took forever for her to tell us and when she did she said I think it's a girl! I just don't know what to do. I haven't even started thinking about girl names and haven't bought one thing yet. So do any other mammas out there have your doubts? If so, how are you coping? It's really on my mind.