Does anyone know what their Cervical Length is?

I'm currently 32+3 with di/di twin boys. Yesterday at my ultrasound both twins weigh 4.5 and 4.4. They checked my cervix length vaginally because I've had random bleeding 3 times since being pregnant. It went from 3.5 to barley a 2.0 in a matter of a few weeks. Doctor didn't seem a bit concerned just said I might deliver earlier (which is fine by me at this point). But has anyone had their cervix length monitored? If so did you deliever earlier or ect..? Thanks!