What gender 20 weeks pregnant?

Hey, I went to my gynecologist today and 4 weeks ago she said it looked like a girl, but today she said it looks more like a boy. I don't care about the gender, but I'm slowly getting curious about what it is and what I should expect. Does anyone know anything about it? Or just write what you think it looks like (it could be the umbilical cord, but the more I look at it, the more it looks like a boy to me).