I have anterior placenta with the cervical length of 3.5 cm from my NT scan till anomaly scan (after that my doctor dint ask me to go for scan so far) and internal OS is closed. Right now 26 weeks pregnant and my doctor has never showed concern or spoke to me about my cervical length. Is it a matter of concern? Should I be worried as I read 3.5 cm is not good? @Dr Shilpitha Singh