Hey guys, so I was wondering if a cervical length of 3.5 cm is normal for 20+2 weeks? My doc said it was fine, but when the ultrasound tech did measurements she measured once as short as like 2.8cm and than 3.5 cm (the US tech told me it wasn't the best) but my OB said it was fine... ... I'm just super worried as I've had BAD bleeding eariler this pregnancy.

I go back when I am 24 weeks, and really want to ask the doc for another scan to check the lenght again but I don't know how to ask or if I should even be worried.

Appreciate any replies!!