Patients can be included when they are at least 10 weeks pregnant. Every pregnant women receives two devices to control daily here parameters in her home environment: a blood pressure monitor and an activity tracker. The women will be asked to perform two blood pressure measurements a day and to wear the activity tracker day and night. This data will be send by Bluetooth and Wi-Fi to the investigator in the hospital. Also will the women be asked to measure once a week her weight and send this to the hospital.