The goal of this observational is to compare in describing fetal health conditions. The main questions it aims to answer are: * fetal electrocardiogram (fetal heart rate and fetal rhythm) * electrohysterography (uterine contractions). Participants will wear wearable devices and CTG equipment for monitoring for 30 minutes.If there is a comparison group: Researchers will compare clinical CTG equipment to see if this wearable device.
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The performance of this system in extracting fetal electrocardiogram (FECG)
Timeframe: 2022.01-2023.08
The performance of this system in extracting electrohysterography (EHG)
Timeframe: 2022.01-2023.08