Quoting MOM2CMM:“ I was wondering how long after a D&C do you usually get your first period?”
It can take as long as six weeks. Sometimes your body skips a cycle in order to put itself back ontrack.It's still confused about whether it's pregnant or not. It'll figure it out though, and you'll get one.
If you're TTCing, it's best to wait 2-3 normal periods before trying again. That way your doctor is able to accurately pinpoint your due date, and your body has had time to heal from the invasive procedure.