I have not had a menstral cycle since april. My grandmother died just before my may cycle and a friend told me that it could be from stress, but I always thought that stress just delayed a period. I have taken pregnancy tests and they are all negative. I have also been experiencing a little tightness in my right side. Nothing painful, just uncomfortable. I have always been regular until now. I was wondering what could cause such a delayed cycle. I have put on some weight recently and wondering if this could be the culprit. Any help would be much appreciated.