Aim of the authors was to evaluate the effects of physical activity on body balance during gestation. Balance testing was performed in 80 normal pregnancies, where pregnancy exercises were regularly performed, in 80 pregnancies where bed rest was suggested and in 80 matched control volunteers (n=240). Dynamic balance was measured with five different tasks of the stabilometer (D1-D5). Data of balance testing of the groups were compared with t-test. Average results of static balance (eyes closed- and eyes opened) tests were significant worse in groups of healthy and pathologically pregnant women compared to non-pregnant women. Concerning the subgroups: those who had previously been involved in professional sports and were healthy and physically active during pregnancy performed better on the open–eye test compared to pathologically pregnant patients. Examining healthy pregnant women’s dynamic balance resulted in significantly worse performed D1-D5 exercises compared to non-pregnant women. Pathologically pregnant women were compared to non-pregnant women results of 4 tasks (D1, D3, D4, D5) showed a significant difference. Healthy pregnant women performed significantly better in exercises D1 and D4 than pathologically pregnant women. Between the second and third trimesters of healthy pregnancies a significant difference was detected in the movement of central point of body mass (D5). 21% of healthy pregnant women and 43.1% of women with gestational pathology reported an episode balance loss. Physical activity has positive effect on balance during pregnancy.