Vaginal Progestrone For Short Cervix

I am currently 31 weeks pregnant and have been taking vaginal progesterone since 23 weeks, 6 days pregnant due to me having no measure-able cervix at all. Im just wondering if any of you have been on it for a short cervix as well and when did you stop the use of vaginal progesterone and when did you go into labor ? Would love to hear stories.