They usually want you to drink the 32oz of water so they can get a good picture of your cervix. My Dr had me do that early in my pregnancy... she took the picture of the cervix and then let me go pee before finishing the exam. :) just drink as much water as you can before the exam
You don't need to drink a lot. I had an ultrasound at 6 weeks and 12 weeks and saw everything just fine. They usually have you provide a urine sample before anyway, so your bladder should be empty. That may be the reason they ask you to drink before?
The very beginning of the scan they use the abdominal ultrasound. Then you pee and they go transvaginal usually
U can finish drinking your water an hr before appointment. Usually just before your appointment the water hits your bladder and you have to pee pretty dang bad lol. They only need the full bladder for the very beginning of the scan in the early weeks if im not mistaken. You wont have to hold it to long dont worry lol
Bring that early on in pregnancy they will do q transvagnial ultrasound or they shouldand you do not have to hold your pee for that one.
They scare you into saying holding water is so important but I peed 10 seconds before my ultra sound and had no issues. Do your best.