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.
Other signs of miscarriage that are common in the first and second trimester include lower back pain, pain in the abdomen and pressure in the area of the uterus. These symptoms are similar to those of labor. Second Trimester Specific Signs of Miscarriage.