Cervix length

Lauren
So I had my anatomy scan today (thank goodness baby looks healthy). They said my cervix length was 3.75 cm or 38mm. They said average is about 4 but they just want it above 2.5 and I'm clearly above that. I'm 18 + 5 but measuring 19 weeks. Is this anything to be worried about? Or am I just looking for another reason to be nervous.