Small cervix

Hi girls I went to my anatomy appt yesterday baby was perfect but dr check my cervix and told me it is small and she needs it to be long enough so I don’t have my baby before time. This happened to anyone ? I cried so much I want my baby to be born healthy and on time. I am going to see a high risk doctor and I am in treatment to make my cervix long enough. Dr ask me to apply a vaginal pill every day at night until last day of pregnancy 🙈😫 someone know or had the same case

I am 21 weeks still half way