Need some reassurance!

Hi all. So when I first found out I was pregnant I weighed 132 lbs. When I went in for my appointment at 14 weeks I weighed 121 lbs. I got to hear the heartbeat it was 159, is that okay? I am currently 16 weeks and 3 days now. My next appointment is October 12th which I’m getting the anatomy scan to find out what I’m having (I’ll be 18 weeks and 2 days). I’ve felt movement that started a little after 14 weeks. I do have a bump but it’s low and I see other people’s bumps at 16 weeks or even earlier and it’s making me wonder if everything is okay with the baby? Like is the baby growing properly? Has anyone else experienced this and baby was fine?