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.
Miscarriage or ectopic pregnancy. Spotting or bleeding in the first trimester, especially if accompanied by abdominal pain or cramping, can be an early sign of miscarriage or an ectopic pregnancy (when the embryo implants outside the uterus, usually in one of the fallopian tubes).