For my daughter I think I got in pretty quick for a dating ultrasound, but I went to a free clinic for that.
My son, I had a dating ultrasound also due to my life style choices at the time... (not so good ones.)
Both of those were 5-6 weeks.
This pregnancy I'm beside myself because I was 2 weeks late! And my leves were only 32HCG the day after my BFP, rising appropriately, however I'm now anywhere between 5 and 7 weeks today and its killing me not knowing. My dating ultrasound is on Monday the 23rd, but I don't think thats a real OB appointment or not. lol Its odd to me, but common.