Hi, I'm five days late on my period. In the past two days I've had some cramps similar to premenstrual cramps, but I haven't gotten my period yet. I took a home pregnancy test on the first day I was late and it came back negative. I'm thinking of retesting soon though. What could be the cause of this delay other than pregnancy. My boyfriend and I had intercourse around mid-August when I was ovulating and last weekend, but we used protection and were very safe about it all. Any help/advice would be great.