With my pre-existing, incompetent cervix, my pregnancy was complicated.
From the ocregister.com
They may also develop incompetent cervix where the cervix can no longer support the growing weight of the fetus, the pressure causes the placenta to rupture and the mother goes into premature labour.
From the en.wikipedia.org
It certainly doesn't make the cervix incompetent as it's a test not a treatment itself.