I wanted the tech to guess the gender at 13 weeks but she didn't feel comfortable with it. I found out at15 weeks and 5 days that it was a girl. II'd give it a few more weeks before you have your heart set on a gender.
I asked my us tech if she would guess with this one at 12weeks some days and she wouldn't even guess cuz she said boy & girl parts look about the same that early I wouldn't buy any blue or pink until next us good luck
Yes boys do tend to develop that early but could develop as late as 18 weeks i would wait till then to get a gender check