MLR - I'm so sorry about your little bubble. I've had 2 blighted ovums, they're cruel
I think it would be unlikely to be your period 1 week after d&c but you should call and ask the specialist if the spotting is normal (might be perfectly fine ).
I had a d&c in the middle of a cycle when I wasn't preg, then got my period at it's normal time (d&c didn't reset anything). But I would think since you were preg, your body would have to lose all the baby hormones, ovulate, then you'd get your period.
Good luck with everything x