More NT test questions

I'm so on the fence about this and need to decide quick. I'm 33 and will be 34 the end of Aug. My midwife said not to if I would not change anything and the chance of a false positive are high and that would cause undo stress but I also recall reading that the chance of a false positive on the triple screen later are greater then the early blood test. If that's the case then I feel like maybe I should just go ahead and do it and skip the later one. Another thought I had was to have the u/s and if anything looked not right then to do the blood otherwise just skip the blood part since I know it's that part that could throw everything off and maybe get the triple screen later, I'm not sure if they'd let me just do the u/s at this point and put off the blood till later..
I know they look for downs and I'm not to concerned with that since nothing would change but they also look for the risk of other major things, correct? Oh I hate making decisions like this, it was so much easier when they didn't even offer it with my DS!!