they suggest you drink a glass of water an hour before the scan. the fluid in your bladder pushes the uterus forward and makes it easier to visualise, esp given your bub will be less than a cm long!
i have had transfers for IVF with a full bladder - it's not the most comfy thing, but also not the most uncomfy - you'll be so busy watching the screen that you'll not notice it too much - plus they usually have a loo just outside the room, so as soon as you're done you can go and empty your bladder!
i was told for tomorrows scan to go to the loo an hour before scan, then drink a full glass of water, and don't go again til after the scan...
i would assume you need the water in your bladder - my first scan, he did external initially, then asked me to go and empty bladder and swap to internal - always better to have a full bladder and empty it, than to have an empty one and need to try and fill it...
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