The aim of this study is to Determine whether cerclage with vaginal progesterone will: 1. Reduce the overall spontaneous preterm birth rate. 2. Prolong pregnancy latency. 3. Improve neonatal outcome. Compared to vaginal progesterone only, in patients with progressive cervical shortening. Research question: Does cervical cerclage reduce the overall spontaneous preterm births in patients with progressive cervical shortening. Research Hypothesis In this current study, the investigators hypothesize that cervical cerclage reduces spontaneous preterm births in patients with progressive cervical shortening on vaginal progesterone only.
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Gestational age of delivery
Timeframe: <37 weeks