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It shouldn't be uncomfortable, and you don't need a full bladder Your sonographer will give you a report of the scan, which will tell you exactly how many weeks pregnant you are.
Keep it with your maternity notes so your midwife and anyone else involved in your care can see it. This measurement, known as the crown rump length (CRL), is very accurate in the first trimester.
The dating scan will also show if you're expecting twins, triplets, or more.
It's helpful to know about twins early on, and it's easier to see whether or not they share a placenta during the first trimester.
It's entirely up to you whether or not you have a scan.