I had both of my children when I was over 40. I was 40 when I had my first and 42 when I had my second; that was 4 months ago. I had the triple screen with the first pregnancy and a level two ultrasound during the second. I knew I didn't want an amnioscentesis, but I did want some reassurance that it was a healthy pregnancy. In both cases, my odds were increased (as compared to the average) so that was good enough for me. If you think about it, those odds were derived from a population that includes poorly nourished, poorly educated women and women with poor access to good medical care, so the way I see it, my odds were already better than the general population's.
I ate well (gained 65 pounds), took good care of myself and both pregnancies were uneventful. Even though I worked until the day I went into labor with my first ds, my second pregnancy was harder. I was sicker and more tired; I'm sure this was because I was working twice as hard taking care of a toddler. Being a mom is so much harder than any job I've ever had. That's why I decided to stay home with my ds (I had planned to go back to work) when I realized that it would be really hard to find someone who was willing to put in that much effort on someone else's kid.
My first baby was 8lb. 11 oz. and delivered vaginally. My second was larger; my ob was concerned that he would be over 10 lb. He was actually 9 lb. 2 oz. at birth, but he was still big enough that after 36 hours of upright labor, he still wasn't engaged. He was born via c-section. I did have some complications, but it had nothing to do with the pregnancy. The anesthesiologist botched the epidural. The needle went too far; I was completely paralyzed, couldn't breathe, required general anesthesia, intubation, etc. Still, my baby was quite healthy, and even though I didn't see him until 2 hours after his birth, he latched on and nursed well right away.
I feel so lucky, so blessed, to have two perfect sons. My husband and I started trying to conceive when I was 37 and during those two years of trying, I had to face the possibility that I might never have children.
BTW, during my last pregnancy, my ob told me that he had seven other patients pregnant over 40, the oldest being 46.
Good luck to you. I'm sure everything will be fine.