I would guess that it probably will start by then, but it's really hard to say, everyone's body is so different, if nothing happens and you go in for another test I'd definitely ask your doc to explain things more about what's going on and what you should do, and if it's ok to keep waiting it out naturally.
Sorry to hear this. I found out at a 10w 3d private scan that my baby never developed a heart beat so I never got past 6 weeks really (although the sac continued to grow) I never bled at all. So I had miscarried effectively 4 weeks before hand and was totally unaware.
Some ladies bleed, some don't.
I hope you bleed soon - I wish I had instead of having to opt for the medically assisted option,
Stay postive honey - everything happens for a reason and your time will come soon enough.
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