The three groups will receive information about the recommendation of physical activity during pregnancy, according to ACOG guidelines [19].
Intervention 1 (I1), maximum intervention: pedometer + goal + reminds (maximum intervention women receive information about the goal of steps/day to be reached: 10,000-11,000. They will receive messages on the mobile phone remembering the goal to achieve and a notification that the researching staff will proceed to collect the average count of steps/day of the week prior to 20th and 32nd GW. Women will get recommendations on physical activity during pregnancy.
Intervention 2 (I2), minimum intervention: use of pedometer watch from 12th to 32nd GW (10 weeks). They will not receive goal information nor reminds to collect information from the pedometer. Women will be given recommendations on physical activity during pregnancy.
No Intervention, control group: without pedometer. Women will receive recommendations on physical activity during pregnancy.
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