I'm very confused! I believe I am on CD31 and still no period. My last period began on December 20th, 2007 and the entire week of 1/6/08 I was very achy and cramping a lot. Immediately following that week I've been extremely hungry and thirsty and am having trouble sleeping at night (though during the day I'm so exhausted). My boobs are a little sore, but no more than I normally get with my period. I took a home pregnancy test twice last week and had two negative outcomes. Yesterday I had pink discharge and thought for sure I was getting my period. Still nothing even by tonight, though! Could I be pregnant even though the tests this past week said no?? Please help- this is so frustrating!