Hi,i M 24 Year Old.in My 3rd Month Of 2nd

Hi,i m 24 year old.in my 3rd month of 2nd pragnancy i m bleeding.i went for scan, baby is fine but my blood still not stopped from 10 days.doctor adviced me bed rest but i m worried about my baby.why it is happening i dont understand.i m having two teb-susten 200 & eldefol5mg.plz help me