I am 6 weeks pregnant. When I went for an ultrasound the fetal heart rate was 128. Is this okay?

Probably fine. Personally i wouldn't worry about it.
Heart rate. That is well within normal limits. A heart rate between 100-160 is completely normal.
Yes within the N. Range but your doc who either did the us or ordered that should be expalining taht to u , u should not have to ask that ? Here, u need to be able to ask your doc any posssible ?S u may ahve that are related to your preg from teh time that doc assumes your care to your post partum visit and your doc should see the scan to make sure everything else looks ok.