OH and I am not pregnant...
I have had the same thing many times. Not with the cyst, but if I cough or sneeze my lower abdomen twitches. I think it is totally spasmodic. Sneezing and coughing is a very powerful body function and we tend to suck in and bend over a bit when we cough or sneeze, contracting all those muscles down there. I certainly wouldn't worry about it.