Sentences with phrase «rises during the first trimester of pregnancy»
The researchers point out that the concentration of relaxin in the blood rises during the first trimester of pregnancy, when a woman's heart rate increases by about 40 per cent.
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Fatigue can be a sign of disease such as certain cancers, auto - immune disorders and a host of other conditions — including pregnancy.Fatigue can also be a sure sign of an early pregnancy, usually occurring during the first trimester and often partially blamed on a dramatic rise in the level of the hormone progesterone.