What is a "weak uterus" or incompetent cervix?

Incompetent cx. If you have this, your doctor should have fully explained it to you already. It is where the cervix opens up too soon, anytime usually after 16 weeks and you lose the pregnancy. It can be diagnosed by an ultrasound before it happens and if you do have incompetent cx., a stitch can be placed by a competent obgyn to keep teh cervix closed and you will have to modify your activity and be monitored.