My last 3 or 4 periods have been shorter than usual. My period usually lasts about 5 days with the 5th day consisting of mostly spotting but recently they've been closet to 3 days with a little spotting on the 4th day. They've also been lighter than I remember but I can't remember when they started to become light. I was worried I might be pregnant having remembered that my cousins period got shorter with her pregnancy before stopping completely. However I took several years and they all camr up negative. Is it normal for these kind of changes to occur? I'm 23 and I am over weight I don't knmownif that could be a contributor. Any ideas?