Daph, I am very sorry to hear of your blighted ovum.
I had a blighted ovum last year, but I did not have a D&C, so things may be different for you because of that. My doctor and my naturopath both told me to wait 3 cycles before trying again. I had been on Clomid, and my doctor would not prescribe Clomid for me again until my HCG went back to ZERO! Totally ticked me off.
In hindsight, I wished that I had gone against their advice and started again on my first cycle, even if it had to be without the Clomid. You may be super-fertile in the few months following a M/C. I think that happened to me because my periods were heavier, but we abstained. I haven't been pregnant since, though not for lack of trying. I was emotionally ready to try again, and I wish that we had!
Check with your doctor, and try to pin him/her down as to WHY you should wait. Like I said, it may be different after a D&C. There may be very good medical reasons for waiting that I don't know about.
HTH, at least a little.