I had my dating scan at 6 weeks, we started off with an external and found the sack, but did an internal so we could see bubs (all 2.8mm of him ). I had to go back at 8 weeks as a HB wasn't present yet, and for the 8 week scan we had an external. Maybe they just feel it easier to start off with an internal? Don't be too scared - it doesn't hurt, and you're able to cover your bits with a sheet.

And may I ask where on the south coast of NSW you are? I was born in Pambula