Girls, hello ? I wanted to ask for advice. August 28th is my husband's…

Girls, hello ? I wanted to ask for advice. August 28th is my husband's birthday. And we will be 27th already 16 weeks and 4 days pregnant. There's still time until the second ultrasound! I wanted to do an ultrasound on the 27th and make a gift for my husband with a balloon (to find out the baby's sex). Do you think at this stage the ultrasound will show the sex? Is it safe to do another one? ??