I was due on my periods 4 days ago... I had period cramps about 4-5 days before I was due, but have still not come on! My husband and I have been trying for a baby for the past few months. I feel tired, nauseous, very bloated and occasionally weak. I have taken 2 home pregnancy tests and both were negative! I don't know if my mind is playing tricks on me! What could this be?