Why am I so exhausted during pregnancy?

Early in pregnancy, many women feel really tired. They go to sleep as soon as they get home from work. Or most of them feel they can’t get through the day without a nap. Why is this so? It is normal to be exhausted! Your body is changing. It is producing more blood to supply the placenta, which feeds the foetus until birth. With more blood your heart is pumping faster which makes you feel tired.