First AF after D&C

Vicki
Sorry this may be a slightly stupid question! I've read to expect first AF after 4-6 weeks - I had a D&C 10 days ago and after a few days of pretty horrible bleeding, it seems to have nearly stopped. So would I expect AF 4-6 weeks from now or from the date of D&C? 
I also normally ovulate cd 16...do you know if your body goes back to normal cycles or can I expect things to be a bit wild for a while? Thanks for your help