Hi..I Am 28 Years Old And I Am 21 Weeks

Hi..I am 28 years old and I am 21 weeks pregnant..3 days ago dr found my cervix is completely open..and he gave me 2 option for treatment. .cerclage stitch or vaginal progesterone tablets..because of the high risks of the stitch..i took option for vaginal tablets..but i am not sure if i choose the best option. .my dr did give me proper details and im not sure i dont wanr loose my baby..which it happened to me 8 years ago i was 17 weeks pregnant and i had miscarriage because my water brokes..so i dont know what shall i do to save my baby ????