I had my tubes tied and burnt 8yrs ago after the birth of my third child. I was in my early 20's when I had my last child. My periods have ALWAYS been regular, every 27-28 days. I have NEVER missed a period unless I was pregnant. My period is 6 days late, I haven't been stressing at all. I took a home pregnancy test on 1/9/2011 it came back negative...I was drinking alot of water...that could be the problem. Well I have been a bit exhausted, and moody, slight cramping on right side and lower back pain. I normally feel this way when my period is on it's way. What could be the delay? I am healthy and am not sure why I haven't gotten my period. Anyone have any theories?