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The indicators and pregnancy outcomes collected at different time points in this study.
| Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | |
|---|---|---|---|---|---|---|---|
| Individual information | √ | ||||||
| Anthropometric | √ | ||||||
| 7-day 24 h fluid intake questionnaire | √ | √ | √ | √ | √ | √ | √ |
| Blood biomarkers | √ | ||||||
| Morning urine and related biomarkers | √ | ||||||
| Environment | √ | √ | √ | √ | √ | √ | √ |
