Does blood and hemoglobin increase at the same time?

yes they increase at the same time as the number of red blood cells increase (which contain hemoglobin) the quantity of the blood increase.

Not neccesaryly, theres a disease whose name i have forgoten in which due to a deficiency in either iron intake or absorption or both, the body is unable to form heamoglobin. why do u guys spell it hemoglobin its HEAMOGLOBIN. jeez