Short cervix .

Has any woman here ever had or have a short cervix in their pregnancy and did you make it to full term ? I'm currently 16 weeks and a few days ago I found out I had a 3cm cervix . Dr didn't put me on any bedrest , but just said to not do too much . He said he will check my cervix next week to see if it got better or worse and will also be giving me progesterone shots . This is obviously worrying me because I lost my daughter at 20 weeks a year ago due to placenta previa.