Placenta abruption 6 weeks

So yesterday I started to bleed... not a lot and no pain but I have had a previous molar pregnancy so I went straight to the hospital. They showed me the baba and could see the heart beating everything looked fine but I have slight placenta abruption , they have put me on bed rest and back at the hospital in a 2 days (my actual doctor not emergency) to see. They told me not to stress or worry and to have bed rest hard as this is scary. Just wondering if anyone can shed some light.