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Your cervix is slightly thinner than it should be at 21 weeks - if you are having no symptoms this could be normal for you - if you are having contractions or bleeding your doctor may want to put a small thread in your cervix to prevent dilation or he may keep you on bed rest to see if the situation improves.

Discuss this with your OB or Midwife.

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Q: What if you have 2.9 cm cervical length in 21 weeks of gestation?
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