Objective: The aim of the study was to examine the change in physical activity level and type during pregnancy weeks in healthy pregnancies and to determine if there is any difference between trimester. Material and Methods: Healthy pregnant women between the ages of 18-40 were taken into the study. The Pregnancy Physical Activity Questionnaire (PPAQ) and the International Physical Activity Questionnaire (IPAQ) were used to determine the level and type of physical activity of pregnants. As the data not distributed normally, the relationship between physical activity questionnaire variables was tested by using Spearman correlation analysis and the descriptive statistics were presented median and interquartile ranges. Physical activity questionnaire parameters and three trimester variables were compared using Kruskal-Wallis, Mann-Whitney U and Bonferroni correction for two-way comparisons. Results: A total of 336 persons were included in the study, 50 in the first trimester, 139 in the second trimester and 147 in the third trimester. There was a significant difference (p <0.05) between total activity PPAQ, sedanter activity PPAQ, mild / walking IPAQ, mild PPAQ and home PPAQ in the 1st, 2nd and 3rd trimesters of pregnancy. There was a statistically significant difference in all three trimester (0.005) between mild, moderate and severe PPAQ values of the cases. There was a significant negative weak correlation between the PPAQ (rho = -0.176, p <0.001) and the occupational activity PPAQ (rho = -0.186, p <0.001). Conclusion: According to the results of this study, it was found that as the gestational week progresses, pregnancies reduce the level of sedentary activity and occupational activities, have more mild and moderate activity during pregnancy, pregnant women had similar physical activity intensities in the first and third trimesters. Further work should be done to determine the differences in the levels of physical activity during pregnancy in pregnancies.