always stressed about the "what if"

Sh
I had to go to the hospital bc of cramping and major pressure and the ER doctor thought I had a funneling cervix so my OB kept me overnight just in case. Well, I saw the MFM the next morning and they said my cervix is perfectly fine and they did an anatomy scan and everything was fine. I just had some major constipation to take care of at home. But now, with every cramp I am worried. I have been cramping off and on the last few days. Nothing major and no spotting or no change in CM. My back pain is a bit major at times.  But now I am worried ALL THE TIME about getting an incompetent cervix. Tomorrow I will be 19 weeks and I am so scared it will happen to me. How common is IC? Can you prevent it? If I try and rest more will it help my chances of not getting it?