If you think these tests will give you peace of mind, then you should go for it. I had a different doctor with my son who is now 3 1/2 and he told me that women my age (39 at the time) never have good results, he recommended an amnio. He didn't push for the bloodwork; so I didn't do it; however, he pushed for the amnio and I finally asked why, he replied, "liability".
My family has other genetic issues; my brother was born with a genetic disorder and I will be honest, If knowing what I found out later during my pregnancy, I would have never had testing done. My doctor at the time and they do this when you're older, had me see his genetic counselor for testing. I ended up doing bloodwork to see if I was an unaffected carrier for my brother's disorder. He was born with Dysautonomia. This effects your autonomic system. He passed away at forty. Not because of this disorder but of something else; but having the disorder didn't help. You can have genetic testing at any time if there is a genetic issue in the family; however, when you're older, they have you do all sorts of bloodwork.
Out of curiousity, I wanted to find out if I was an unaffected carrier. They tested me for other disorders as well. I am Jewish and there is a ton of disorders. I asked my counselor what was up with my ancestors and she said it was because they intermarried or didn't marry out of their communities. Well, my husband isn't Jewish and so he didn't have any testing done. My bloodwork came out great except for the carrier gene for my brother's disorder. I was so upset, I couldn't breath and cried and cried. I had to go through this but I was upset with myself for having this test as I was already pregnant and I wasn't planning on terminating.
My brother was the best person that I knew and did so much with his life.
I thought if they had these tests when my mother was pregnant, he might not be here and that would be terrible. He lived a great life. This is the issue that I had to deal with and to deal with all the other testing just made me crazy; so, I didn't do an amnio which they could have tested my son to see if he had the disorder. I'm not big on testing so the carrier testing I did and I regret.
My son was born beautiful and healthy.
I have a different doctor now who delivered my daughter and out of curiousity, I did the bloodwork and the ultrasound testing. They did the nuchal fold testing. This is quite stressful when you are going through it but I wanted to see how all these tests came out and they came out perfect.
I was 42 when I did the bloodwork and the ultrasounds. It was out of curiousity. They still pushed for the anmio's but I refused. They, meaning my neonatalogist. My ob wanted me to do more genetic testing and I told him no and he left me alone.
Not sure if I would do testing again, if I chose to have more children I wish we could go back to having baby's at home without the stress of testing and hospital prisons. I have had two c-sections. The first one wasn't by choice the second one was by choice. I didn't want to do it but I believe it was best for my daughter. I do hope this helps.
My advice to you is to enjoy your pregnancy. Mazeltov!