It is often said that every pregnancy is different from the other ones, and that expectant mothers are the most difficult people to create stereotypes about; as each experiences her pregnancy differently from the others. That may well be so, but the truth of the matter is that there are some pregnancy signs that are shared across board by all expectant mothers. These especially include the 'psychologically-rooted' early signs of pregnancy: like persistent fatigue, light-headedness, queasiness and a very unique set of mood swings and irritability with pretty much anything, where some women in early pregnancy have even been known to get quite mad at just the hearing of some music lyrics -which have nothing to do with pregnancy in the first place, and which they were previously quite okay with, before their pregnancy.