movements along a demand curve are related to a change in price resulting in a change in quantity shifts is demand d1 to d2 are specific to changes in income preferences availability of substitutes and other factors
Signs and symptoms of an early miscarriage (or chemical pregnancy) would generally be spotting or vaginal bleeding similar to a menstrual period, and possibly some abdominal cramping. The bleeding might have more clots than a menstrual period; the clots would look like tiny lumps in the vaginal discharge.
Unfortunately, bleeding in early pregnancy can be a sign of a miscarriage or an ectopic pregnancy. In both cases, you also usually develop tummy or pelvic pain and cramps. Early miscarriage usually happens when a baby is not developing properly, and the bleeding becomes steadily heavier.