Doesn't work for me..lol! Usually they want u to drink so much water to fill the bladder and make it easier to see baby, but your already far enough to where they see baby good enough for prior water intake. I was told that my pictures or US was so clear because of the amount of amniotic fluid In there, so I think it may differ between all women in general just going by that fact 👀

I'm not sure if it matters at 30 wells, but early ultrasounds yes because you need a full bladder