An elevated white blood cell count during pregnancy can be a physiological condition and is not harmful as long as the elevation is not significant and does not reflect a pathological condition. In the middle and late stages of pregnancy, the leukocyte count can be elevated, mainly due to an increase in the neutrophil count, which can reach between 9 and 15 in the late stages of pregnancy, and gradually return to the normal range only a few days after delivery. If the leukocyte elevation during pregnancy is physiological, it is not harmful and needs to be differentiated from pathological conditions. If there is a bacterial infection or other pathogenic microbial infection at this time that causes an elevated white blood cell count, it will rise even higher from the physiological elevation. The increase in white blood cells during pregnancy should be looked at to see if it is a pathological state, and only if it is pathologically caused can it be harmful.