When I was pregnant with my daughter, I found this crazy old wife's tale that if you pour urine on soda between weeks 10 and 14 you can find out your baby's gender. If it gives a few bubbles and dies its a girl and if it foams like beer its a boy. Last time it was correct, let's see if this one turns out to be a boy lol :)
@laurenjaynebutcher I'm not sure, I think it just said baking soda (but not baking powder, apparently that just always foams). I used the cheapest one from sainsberys, I'm pretty sire it was their own brand one, both times!