I’m 28 weeks pregnant and have been getting my cervix checked for a short cervix every week since 22 weeks and has been staying about 2.2cm since then except this week I went in a was checked and I was 1cm dialated. I couldn’t get my fetal fibronectin test done that day because it can not be done in 24 hours of the ultrasound. So I went in today and I was 2cm dialated but my test came back negative. Has this happened to anyone else? How long did you last?