Is this a Girl????

Alanna
Is this a girl? I'm 16 weeks and 5 days and we are expecting our second child. We have a 2yr son now and it was definitely visible finding out he was a boy but we also found out with him at 20 weeks. We found out early with this one but I want to make sure it's a girl. I don't want the dr to be like Oops my bad!