Why does a pregnant woman feel tired?

Fatigue experienced by the mother-to-be in the very beginning of pregnancy is quite common evidence. The many changes in the body that occur after the implantation of  fertilized egg to the inner wall of the uterus, women are perceived as fatigue and drowsiness. The reason of it is the lowering of blood pressure,  sugar and hemoglobin level in the blood, changes in metabolism and hypnotic effect of progesterone – the hormone, what retains pregnancy. Additional research of specialist helps to  determine whether a certain treatment  will be needed or only vitamins will be enought.