I know it's hard but try not to worry about it. On my first, very long-awaited pregnancy, my risk came back as 1:7 which was an absolute hammer-blow, especially as I'm not particularly old so I knew that it wasn't going to be affecting my result. I knew that I would continue the pregnancy either way but I also know how it feels to get that piece of information and it suddenly makes you question all those internal assumptions and imaginations you have, about what your pregnancy and motherhood experience would be like.
I also found out by phone at the airport, about to board flight to the other side of the world for a 2-week work trip, so I had about 24 hours of plane wifi to do some very emotional googling, and had to wait until I got home to do the NIPT test.
The waiting was the worst part of it. I really felt like I was robbed of a month of my pregnancy joy. The NIPT test itself was fine the results were quite quick, and my result came back negative.
Like you, I did a lot of reading about what the individual results meant, and I wouldn't be surprised at all if your IVF pushing up your HCG result, plus your (slightly) older age have skewed your result.
If the same thing ever happened to me again, I would try to remind myself to try to stay as relaxed as possible and try to keep busy and not think about it so much.
I'd suggest that you take a moment to speak to your partner about it too - I was very surprised that my husband actually took the news much worse than I did. But try to to keep enjoying your pregnancy while you wait for the result; it's such a special time - especially when it's been a long time coming!
Best of luck with it, and with the rest of your pregnancy!