1st dating scan

Laura
Hi I just wanted to ask if this was normal.. I'm pregnant with baby #3 my first appointment letter for my dating scan (first scan) came through the other day and I've to go on the 30th Nov. That will make me 10 weeks 3 days. I'm quite confused ad with my other 2 I was 12 weeks before I got my scan. Anyone had one before 22 weeks ? Y d u think I've to go so early ? Will I be able to make my baby out on the screen ? Thanks x