A normal pulse rate for pregnant women is about 80 to 90 beats per minute, according to the Jillian Michaels website. During pregnancy, the heart pumps about 30 to 50 percent more blood than usual. As a result, the pulse increases from its normal rate of 70 beats per minute.
Women's bodies require more blood during pregnancy to supply oxygen to the fetus through the placenta and to account for the woman's metabolic systems working harder, the Jillian Michaels website notes. Pregnant women who wish to monitor their heart rates can track their pulse for one minute at different times throughout the day and write down the number. At the end of the day, dividing the total beats recorded during the day by the number of times the pulse was taken provides an average.