Vaginal progesterone how far do I stick it up there?

Mandy • 💏2012 🎀👶🏼1/10/14👼🏻+👼🏻+👼🏻+👼🏻2019👼🏻6/30/19,👼🏻5/31/20

Ok so I recently had to have an emergency cerclage placed and my new ob put me on vaginal progesterone to try and help with my cervix and contractions. I’m about to do my first dose but I’m sitting here now and I’m like um how far do I stick it up there?