Need reassurance or real talk: hCG levels

Need some thoughts, please help! I got my hCG levels tested last Thursday and they were 1472. 6 days later (today) I went back and they were 3407.9. I’m 6w2d. Does this increase sound okay? Doc says adequate and to move forward with ultrasound. Anyone else have similar levels and be okay? Anyone have similar levels and NOT be okay? My biggest concern is my loss of symptoms (besides bloating… so so so bloated).