39 weeks - 3 cm dilated posterior cervix?

Amanda • One early miscarriage at 5w in April 2015, second early miscarriage in June 2015. Healthy baby girl born April 2016. Third early miscarriage feb 2019 and Fourth early miscarriage May 2019.TTC BABY #2

My doctor today told me I'm about 3cm dilated but I have a posterior cervix. I was so thrown off by the pain (second baby but this doctor was rough) that I didn't ask what that meant. Any idea?