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Spotting after D&C is common. As you have not been experiencing any pain or fever
it is unlikely to be due to infection.
You have mentioned why D&C has been done . Whether for abortion
or other medical reasons like menstrual irregularities
Coming to the smell you have been complaining of it is due to dead endometrial cells( If D&C was done due to treat menstrual irregularities) or products of conception ( If D&C was done as a part of abortion)as a result of D&C and due to the action of vaginal acidic secretions on blood. It is a common problem after D&C.
Just stop thinking of of it and you would be back to normal very soon.
Wish you a speedy recovery.