Baking Soda Gender Test Help

Hi Everyone, so I thought I'd do th baking soda gender test just for a bit of fun but not sure if I'm doing it right!!! All of the videos I've seen on YouTube are America ladies using baking soda. When I used baking powder, as soon as I added the smallest amount of urine it was like a volcano of froff coming out the cup! So I tried bicarbonate of soda and had no fizz at all. I know we like to have different names for things either side of the Atlantic so wondered if anyone knew what the product is called in the UK that I should be using. Thanks xxxx