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.
Keep in mind, though, that up to 1 in 4 pregnant women have some bleeding or spotting (finding spots of blood on your underpants or toilet tissue) in early pregnancy, and most of these pregnancies don't end in miscarriage. Abdominal pain. Abdominal pain usually begins after you first have some bleeding.