There are ways you can know whether you are having a baby girl or a boy without using the USG. Your physical appearance as well as other subtle sign can be used pretty reliably to determine whether you are going to paint the baby’s room blue or pink. The infographic also contains information on what you can do in term of dieting to nudge the gender selection towards your wish.
All you need is a sharpie (any color) and a porcelain dish that you want to permanently alter. You can even use super cheap mugs from the dollar store to create gifts or party favors. Just draw on the surface of your mug and bake it for 30 minutes at 350 degrees. Allow them to cool completely before washing or using.