Hi Minni..that must be so hard to be planning a baby shower at this time! I can't imagine. Sorry for your loss.
I'm in the same boat as you... now waiting for AF or maybe BFP, if I'm lucky? I tested and was ovulating exactly 14 days after my D&C on Sept 20th, but not sure if I will be lucky or not. My husband and I are also letting whatever happens happen.
My doctor told me that it's ideal to wait 1 cycle for dating purposes, but that she's had many patients get a BFP right away, with no visit from AF. So sorry that I don't have an answer on when to test...just wanted to let you know, I'm in the same boat.