This is my Decemebe cycle. My AF is due 1/12. For the past week and some I have been experiencing a lot of cramping, always tired, mild headache on and off and really really sore nipples. This is seriously not normal for me. When I expect my AF, only my lower back hurts and that's like a day before. I took several test and they are all negative. I took one 5 minutes ago and that was also negative. Could I be pregnant? I don't know what to think! Help me please!