I had one at 28 weeks and they advised me to have a full bladder but I don't think you really need to. Might be worth just having one just in case, you can always go to the loo if needs be.
I had one and didn't need a full bladder. I had one at the 20 week scan and they made me go pee first
You're baby is big enough now so they won't need a full bladder
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