The purpose of the research study "Heart Sounds at Home" is for pregnant SSA or SSA/SSB (Sjögren syndrome B) antibody positive mothers to use a Doppler fetal heart rate monitor to detect abnormal heart rates and rhythms in their babies before they are born.
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Development of Fetal AV (atrio-ventricular) heart block
Timeframe: Date of randomization until the date of first documented progression, assessed up to 41 weeks.