I think that sounds good. I had shortened to 2.4cm at 20 weeks. I stayed the same until about 30 weeks when I dilated to 1cm and my cervix shortened to just over 1cm. I still made it to 36w2d with strict bedrest from 30 weeks on. GL, hope you're able to hold strong for awhile longer
Re: What's a good cervical length for 31 weeks?
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For 31w with trips I'd say that's pretty amazing!
I was around 3.5cm @ 32w, but I only had two.
I went in yesterday 28w5d and mine had shortened to 2.1 from 3.1 two weeks ago. I got put on bedrest and have to get steriod shots tomorrow and sat.
My MFM said anything over 2.5 is totally fine but once you get below that you should start to take it easy.