Crazy question but need answers

So I’m 23. +3 days and I went for my anatomy screening today. Found out in having a little prince which I couldn’t be happier about 😁

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But anywho the np said the at the beginning of the screening my cervix opened and by the end of it it closed..... asked her what that meant and she really didn’t give me an answer just tried to reassure me that the baby is nice and healthy... in two weeks they want to do a vaginal ultra sound to see what my cervix looks like. I have two girls so this is my third pregnancy and the first time I’ve ever heard of something like this.. I googled a little bit and it said I could go into labor way before my due date.

Sorry this is kinda long, but I guess my question is has anyone heard of this issue or gone thru it,and if so what does it all mean?