Going on 25 days still no AF! ERRRR!

Hi I am 30 years old I feel like I am going crazy I have kept track of my cycle since Feb. 2010, my average cycle is 35-40 days! The First day of my last period was Oct. 14 and was shorter this time right on the 28th day! My cycle lasts between 3 to 4 days mild cramps never really got those either! I was to stat Nov.18 2010 boobs a little sore, weird pinching cramps but AF never came I have taken 2 prego test both neg. MY hormones are going crazy! This whole month I have felt these pinching not anything like the cramps I do usally get before AF.

I went to doctor and they took a blood test Dec. 3 it came back neg. it is now Dec. 13 my boobs have been sore going on 15 days now still no AF. I tried to find my cervix which I have felt before but I couldn't find it this time. Beging to think that something is wrong with me. I'm afraid to take any medicine or drink alcohol due to thought of might being pregnant and it's the holidays so getting very upset. 2 nights ago I started crying for no reason, all my pants are tight, I used to go without eating but if I do now I feel sick if I don't eat, I pee alot! I think my body thinks Im prego LOL any advice would be thankful;)