6 weeks 2 days ultrasound , no heartbeat yet ?

Rachel

I’m super worried , my OB couldn’t see a baby just the sac and no heart beat yet. I’m seeing a lot of other women posts on around the same week and they got heartbeats and a more of a different fetus shape , mine is literally just a circle . With my daughter you can clearly see her. This is my second baby

. Should I be worried ?