Doctors and midwives usually start checking for cervical dilation in the last few weeks of pregnancy, often around 36–40 weeks, but it can vary based on your situation and preferences. If there are concerns about preterm labor or other complications, checks may start earlier, while some providers skip routine checks unless there are labor signs or you specifically agree to them.

Typical timing

  • Many OBs and midwives begin offering cervical exams around 36–37 weeks, often at weekly visits until birth.
  • Some practices wait until closer to the due date or until there are signs of labor (regular contractions, bleeding, water breaking).

Why they check

  • To see whether the cervix is starting to open (dilate) and thin (efface), which can hint at how close you may be to labor.
  • To have a “baseline” so if you come in with contractions later, they can tell if your cervix has changed since the last visit.

How the check is done

  • The provider wears sterile gloves and inserts two fingers into the vagina to feel the cervix and estimate dilation in centimeters.
  • Many people find this uncomfortable but it should not be sharply painful; you can ask to pause or stop at any time.

Things you can choose

  • Cervical checks are usually optional in low‑risk pregnancies; you can ask to limit them or only do them when medically needed.
  • Ask your provider:
    1. When do you usually start checking for dilation?
    2. Do I have to have weekly checks?
    3. What will you do with the information from the exam?

Bottom line: most start checking around 36–37 weeks, but the exact timing and frequency should be a shared decision between you and your provider based on your comfort level and any risk factors.

Information gathered from public forums or data available on the internet and portrayed here.