I had my first OB appointment today and they did an US. I was only 5w6d, so there wasn't much of a heartbeat. The doctor didn't seemed concerned but did ask me to come back for another US in 2 weeks. Should this concern me? I had read that you will only visit every 4 weeks at the beginning. Just worried that she might be considering me as high risk or something if she wants to see me back again so soon.