Should I worry?

So of course I'm worrying again. At 9 weeks I had an ultrasound and saw the heartbeat it was at 180 and I have another one in 8 days but I'm worried again and hoping the baby is okay. Iv had some symptoms like sore boobs heartburn and get sick when I smell certain things. Is that a good sign? Okay so let me throw in that I had a miscarriage a year ago so I'm just making sure everything seems to be going good. Reason I am worrying is because my stomach hasn't grown much and my symptoms aren't as strong today as they were last week. Please leave your rude comments to yourself.