Welcome to HCM.
You are carrying pregnancy
of 8 wks plus and foetal heart beat about 80-85 on USG. Normal FHR is 120-160 BPM.
Low FHR is indicator of Miscarriage
or early abortion
and chance is 80% if FHR persists under 90 BPM. So you can take those injections as prescribed by your doctor and do repeat USG to view Foetal Heart Status.
Take healthy diet and avoid stress
Be well and tc.