Anyone else been told that their cervix is shortened but Dr's don't put you on bed rest due to latest research indicating it won't help prevent labor?

Ultrasound tech made us nervous at 34 wk ultrasound ...wouldn't let us leave office b4 speaking with dr...said cervix was 1.9 cm when should normally be 3-3.5

Then they just let us go and basically just told me not to exercise etc LOL. Confusing!!