MC with no bleeding?

Last Monday my doctor confirmed that I had a chemical pregnancy. My last period was January. I have not bled a drop since then except a little with implantation. Am I the only one? I got a positive opk last week just days after my level was 0. Could it be possible I'm pregnant again? (Wishful thinking). Why no bleeding of any kind?? Confused. My doc said I should bleed with normal cycle but have not had any.