Introduction and research objective: Physical activity is an indispensable component of a high quality of life for a pregnant woman. Pregnancy brings a lot of changes in the body, so there is an increased need to take care of the pregnant woman's own health and the health of the fetus, and physical activity contributes to this. The aim of the research is to examine the relationship between the level of physical activity during pregnancy and the outcome of childbirth. Participants and methods: The study included mothers aged 18 to 40. The research was conducted on a sample of 137 women. The research was conducted online, through an anonymous survey with closed type questions, covering mothers from all over the Republic of Croatia. The sampling method is a convenience sample. Results: The most common activity among women is walking, practiced by 56.39 % of the total number of pregnant woman. Most of them walk 3-4 times a week, which accounts for 18.94 % of the total number of pregnant woman. Regular physical activity, defined as exercising every day, is practiced by a quarter of the respondents, which suggests a relatively high level of awareness of the importance of physical activity. Overall, the largest number of women, regardless of the level of physical activity, gave birth in the 40th week of pregnancy (53.79 %). The highest percentage of natural births was recorded among women with a moderate level of physical activity, while the lowest percentage of natural births was recorded among women with a low level of physical activity. Conclusion: The most frequently used form of physical activity among pregnant women was walking, and the level of physical activity was mostly marked as moderate. This research confirmed the frequency of natural births in pregnant women who performed physical activities of moderate intensity during pregnancy.