Thanks for the query.
According to your description there is possibility of pregnancy
which ended in miscarriage
So you better consult gynecologist and undergo ultrasound
to rule out pregnancy and miscarriage.
If any evidence of retained products is seen better to go for D&C.
If ultrasound could not pickup any signs of pregnancy, then the possible cause is anemia
may be due to menorrhgea.
If so in the same visit itself you can get investigated for the cause of these problem and treatment can be taken accordingly.