Does my heart have to work harder when I get pregnant?

Yes. The amount of blood your heart pumps per minute increases by almost 40-50%, mainly in the second trimester of pregnancy, and then stays more or less stable at this level until labour. This increase in the work done by your heart is brought about partially through an increase in your heart rate (by typically around 10 beats per minute) and through an increase in efficiency of the pumping action of your heart.
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