That little guy or gal is still doing well and the hematoma is tiny. Even if it stays for the rest of the pregnancy, it'll be getting tinier and tinier in relation to the size of the baby. As for the wanting to do another u/s, that's good. They are appropriately concerned.
Isn't it amazing how quickly they grow. Just remember that by the end of 8 weeks, they have all their organs--it's just a matter of growing bigger from then on and maturing the organs they've got.