Hi Sandy 79,
I've been fortunate to not have any side effects from Crinone at all. Occasionally, I would feel a 'twang' or pinch in the belly, but this doesn't last, and I assume it's probably due to me focusing all my energy in hoping the little embie takes! The only thing I really dislike about it is the globby discharge you get after a while of using it.

Best of luck and sending all you ladies lots and lots of sticky vibes!