Arimeh - Just thought I would pop in and give you an answer to your question. In my March cycle I had a heap of cm during "O", and during my "O" in April I had nothing, I had the "O" pains but no cm. Yet guess what? I am now 6wks 5days pg. So you definately can "O" without cm and fall pg. I was only telling my BB at the time I believed I was "o"ing on how dry I was and I would be amazed if I fell pg. lol