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A D&C would typically only help in this situation if there is a problem beyond a fibroid, because a D&C would not address the underlying cause of bleeding with a fibroid, and may make it worse.
A fibroid causes bleeding because of pressure on the endometrium, the lining of the uterus. In the endometrium overlying the fibroid, the endometrium may be thinned and denuded, exposing deeper tissue that then bleeds. There is a raw surface with each period in every women, as the upper layers of the endometrium are lost, but there is healing over the raw surface. However, in a woman with a fibroid, the pressure from the fibroid prevents regrowth of a normal lining over that raw surface.
A D&C is designed to remove the upper lining of the endometrium along with any excessive endometrium or growths, such as a polyp, but this is usually not going to help with the bleeding from a fibroid.
An ultrasound may suggest whether there may be another condition present that may be helped with a D&C. But if it is certain that the only cause of the bleeding is a fibroid, then a D&C would typically not help and may make it worse.
If I can provide any additional information, please let me know.