Almost a month since miscarriage and still bleeding...

Kortney
I had my miscarriage on May 8th and I am still bleeding like a regular period. The last hcg level that my doctor took were 135 which had slightly dropped from 185 then 155 and now 135. My last hcg was taken about 2 weeks ago and the bleeding is still not going away. Is this normal? I haven't had a d&c and hoping I don't need one. But bleeding for a month after a miscarriage seems too long..