Is it common for a shortend cervix to get longer?

Not sure if it is common or not but I was diagnosed with a shortened cervix at 16 weeks. My cervix had fallen to 2.8. I was placed on bedrest for one week. At 17 weeks, it measured 2.3. At 18 weeks, my cervix grew to 3.4. So I do know that it is possible. Good luck.