I went for a quick u/s and cervix check and left completely confused. The sonographer said my cervix was 3.6cm and very normal. I said ok, so it shrank by 2cm in the past 2 weeks? She was super confused then looked back at my last appt's paperwork and deduced that the previous tech "over-measured". OK, so if the other tech over-measured, who's to say this one didn't? Or under-measure? So she checked my cervix again and got a reading of just over 4cm. So what is it, 4 or 3.6? She basically said it didn't matter because it was all normal.