Ultrasound scan heartbeat

Hi everyone! I went in for my scan few days ago at around 7w and the doctor detected a heart beat at 162bpm. He told me that it should be normal but upon googling, it seems like 162bpm at 7w is a bit too fast and normal range should be about 120bpm? Can anyone advise? Also, I started having some bad symptoms at 5w (dizziness, nausea, food aversions, sore boobs) currently at 8w and my symptoms seems to have reduced. nausea seems to reduced quite a bit. My appetite is also getting better. Is that something I should be worried about? 😭 isn’t it too early for my symptoms to get better?