What would you do?

I found out I was pregnant September 18th I went to the hospital on Monday cause I was spotting a little bit it stopped by the time I got to the hospital they told me everything looked fine they saw the fetus and even got a heartbeat of 165 I was under 6 weeks and yesterday I go to a different hospital and they couldn’t see the fetus or get a heartbeat they told me I’m under 5w7d so the machine couldn’t calculate it they want me back in a few days I had a miscarriage before so I’m freaking out idk what to do and which hospital to trust I’m thinking about going back to the same hospital that saw it and see if they see it again what would ya do?

Edit- my OB doesn’t have the ultrasound in her office so she sends me out to an outpatient to get it done