Is it possible/likely for a preterm cervix to un-dilate?

My cervix is dilated 1.5cm, soft and low at 32 weeks. I’ve lost a lot of mucus plug too. (She checked because of that) Doc is nervous and gave me steroid injections. If I’m the same or any more dilated next week, she might put me on total bed rest. Is there a chance it’ll close back up? If so, is it likely? TIA!

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