It's not usual that a Genetic Counsellor is there at every 12w scan.

If there is a high risk of Down's then the GC will explain the other testing that can happen, what trisomy 21 is, how it affects a baby, possible mosaicims, also any other genetic problems that may run in the family and the chances of your child having this.

TBH, if you have had IVF then I would have thought this should have been pre-pregnancy; this way you can screen embryos or talk about potential problems BEFORE pregnancy.

As Kate says, it's advice and understanding; a lot of a GC's job is explaining geneics and statistics, as many people were told it was "hard" at school and so have little knowledge.