Feeling Different

My last period was May 6, next period due next Friday (June 2). It could be PMS symptoms I am experiencing, but I somehow feel different. I was in bed all day today with extreme fatigue. All I could think about was how bad I wanted Mexican food. I've also noticed some low pelvic cramping, and I cried the entire time I watched the Sex and the City movie this afternoon. My husband and I use the rhythm method for birth control. Like I said, these symptoms could very well be period related. But something just feels off.