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As per your history you are having pv bleed and your doctor advised bed rest
There are many causes of bleeding during pregnancy
as - Abortion ( threatened abortion
, inevitable abortion, incomplete/complete abortion) Ectopic pregnancy, blighted ovum
, Placenta previa
, Abruptio placentae etc
Gynae doctor advises strict bed rest to avoid the bad consequence of Fetal Loss hence Follow it. U take Medications prescribed by Gynae doctor only.
By using the helpful guidelines by obstetrician/gynae doctor you can prevent this in your further pregnancy.
Have a Healthful Day