During 20th week of pregnancy cervix is softening but still long and thick on ultrasound Is this necessarily a bad sign?

It is not necessarily a bad sign. The cervix undergoes changes during pregnancy as it prepares for labour and delivery. It is normal for the cervix to start softening and thinning out as the pregnancy progresses, while still remaining long and thick. These changes are part of the body's natural preparation for childbirth. The exact rate and timing of these changes can vary from woman to woman, and it doesn't necessarily indicate any problems or complications with the pregnancy. However, if you have any concerns or questions about your cervical changes, it is always best to consult with your healthcare provider, who can assess your individual situation and provide guidance.