D&C after miscarriage at 4 weeks?

Is it worth having a D&C (dilation & curettage) after having a miscarriage at 4 weeks?

Ive heard many times in the past that having a curettage after a miscarriage can help increase fertility. When I had a miscarriage at 9 weeks a few years back I had one then. Unsure if its necessary, will help with TTC or will make any difference at all?