My d&c Jan07 has seriously affected my cycles. None have been consistant since. Sometimes 24-25days sometimes as long as 55-60days! I was 28days like clockwork b4. I have had several u/s and b/w and all is normal.
You can have a period, but not ovulate. More likely it's spotting from the 2nd D&C. I just had one 5 days ago (for 3rd m/c); spotted one day, then nothing, now a bit again on day 5. Was told it could be off and on for a few weeks.
I'm not aware that a D&C won't affect your cycle. I think you need to wait. If another 4 weeks go by and still no period, talk to you doctor about taking provera to induce your period. After my first m/c and D&C, it took over 10 weeks for my period to show up, and only after I took the provera.