Answers are grounded in this paper and cite their sources.
Among women with bleeding in early pregnancy, progesterone therapy administered during the first trimester did not result in a significantly higher incidence of live births than placebo. (Funded by the United Kingdom National Institute for Health Research Health Technology Assessment program; PRISM Current Controlled Trials number, ISRCTN14163439.).
No takes yet. Share an insight, caveat, or question.
Coomarasamy et al. (2019) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: