Prevalence and course of pregnancy symptoms using self-reported pregnancy app symptom tracker data M Nissen et al, NPJ Digital Medicine, October 11, 2023

From the abstract: "We report real-world evidence from patient-reported outcomes that exceeds previous works: 1,549,186 tracked symptoms from 183,732 users of a smartphone pregnancy app symptom tracker are analyzed. The majority of users track symptoms on a single day. These data are generalizable to those users who use the tracker for at least 5 months. Week-by-week symptom report data are presented for each symptom. " https://phgkb.cdc.gov/PHGKB/phgHome.action?query=Digital%20health&action=search&Mysubmit=Search