Nevanna - Two thoughts - first - you can have some anemia from the blood loss of the miscarriage, and that can cause fatigue. It would be wise to take a multivitamin with iron, and an extra iron pill once a day, for the next month or so (don't keep taking iron beyond that unless your doctor says you need to).
Second - ask your doctor to check a blood test for thyroid disease. Low thyroid causes fatigue AND is a risk factor for miscarriage and infertility, so if you have an undiagnosed thyroid problem, it could be related to both things.
