This study aims to measure the percentage of hemoglobin in the blood of pregnant women (Hb)  and study its variations with the progress of pregnancy months and times of pregnancy. Blood samples were taken and hemoglobin was examined for about 150 pregnant women in different pregnancy months ( from 4 to 9 ) and for three pregnancy times (the first, the second, and the third pregnancy ). It is found in this study that Hemoglobin is decreasing generally with the progress of pregnancy months. Hemoglobin also decreases with an increasing number of pregnancies, with the highest mean hemoglobin in the first pregnancy and the lowest average hemoglobin in the third pregnancy. This means that hemoglobin decreases with the recurrence of pregnancy. Then a statistical test using Chi-square was made and it is found that there is statistical significance for decreasing hemoglobin with the recurrence pregnancy times at a confidence level of 10.