CD 40 and still no AF?

Debbie
Ok so this is just me ranting and wondering.  I had a miscarriage on June 3 and still no AF since then.  I was confirmed a positive ovulation via bloodiest but still no bfp.  Anyone get a positive bfp after CD 40?  I am also scheduled for a diagnostic hysteroscopy on Thursday and am worried that it's too early for bfp and the procedure will damage implantation....  Anybody with this experience?  Outcomes please....