Baking soda gender test

Hey there! Has anyone heard of how early you can do the baking soda gender test? Glow says I'm 8 weeks, but we find out for sure at our first ultrasound in 2 days! Either way, I decided to give the test a try just for fun! This was not my morning urine, but it still bubbled a little...indicating a boy! Should I try when I'm further along, or with the morning urine? What were your experiences?