Not Dilated

Has anyone has this happen? I’m just so confused. This is my 2nd baby. She is incredibly low. I’ve been having on and off cramping, lots of Braxton hicks, and even some random contractions. I’m 37 weeks. At 36 weeks, the midwife told me I was 1/2 cm dilated and 50% effaced. Today at my appointment, I was told I’m not dilated and not effaced. I don’t understand how I’m going backwards with this especially with all the cramping and how my body has felt recently.