Hi, Cith, sorry you are having to go through this.
Do look at the website linked to above; it is very good at talking you through the advantages and pitfalls of various antenatal tests.
The screening tests only give you odds for something to be wrong, ie 1 in 29 risk of Downs also means 28 in 29 chance of NO Downs.
I had one amnio and CVS x3, no miscarriages due to the tests (had 4 MMCs before). CVS is IME more sore than amnio which I thought was no worse than having your blood taken for instance .
I opted for CVS because it can be done earlier, I had a high (1:4) risk of Patau Syndrome due to a genetic problem I carry, and I would have opted for termination if I had carried an affected baby. And if it had ocme to that sad option I would have wanted to have it done as soon as possible.
So, there is my train of thought.
As others have said, there is no right or wrong. You do not have to have diagnostic tests. Think carefully about what you will do with the information provided.
I do hope everything will go well for you, whatever you decide.
Good luck .