For a start you should have been told your result shortly after the nuchal scan. They calculate the results of the scan with your blood results and advise you after the scan so to be told you have to see your dr is not good practice.
With ds2 the scan was great but my bloods indicated bub was high risk of 3 trisomies. I had low Papp-a. I went on to have the CVS and all was clear. I knew little about how the results are calculated etc then and I was a mess waiting for my CVS and results. This time round I have done a lot more research. I now know that low Papp-a is common with IVF as is high HCG, the hormones play a big part in the bloods. So this time round I am not as anxious as I was last time and certainly won't be worrying so much if my bloods indicate a high risk trisomy again.
The Cvs and amnio are similar, just done at different times of the pregnancy. Honestly the Cvs didn't hurt and was very quick. It was mildly uncomfortable for a few seconds is all.