How much bleeding is normal after a d&c and hysterscopy (polypectomy)? i have bleeding that seems comparable to a normal period 4 days after surgery.

That's normal: Bleeding comparable to a normal period is well within what is expected and is definitely safe. The only time a woman should be concerned if she has much more bleeding than a normal period, free bleeding (a steady stream of blood), prolonged bleeding for much longer than a period, or if she becomes light-headed with heavy or prolonged bleeding. It sounds like you are doing fine.