Miscarriage

Has anyone’s dr been wrong about them miscarrying? Baby measured 6 weeks but had a heart beat just very low so my dr said she thinks I’m having a miscarriage. No follow up ultrasound, just gave me options to use medicine or dnc. I have barely bled at all only a tiny bit of spotting so what if she is wrong? I think it’s strange she didn’t want to do at least blood work to check my levels before giving me meds to start bleeding more