Hi, I am a 19 year old, healthy female living in the United States. I have my appendix removed in January, and had mild pneumonia twice in Feb. & March. I have not had my period yet, and it is now May. I have missed my periods at the end of January, Feb., March, April. I have taken four pregnancy tests over that same time frame, all negative. I am wondering if the appendix removal affected my menstrual cycle somehow?