Could I really be pregnant?

Could I really be pregnant after a tubal ligation surgery that i had done almost 6yrs ago? I've been having some strange symptoms. The one that struck me the most is how sore my breasts are and i still have 2 weeks til my cycle. I've been dizzy, tired, and all I want to eat is McDonalds fries and their vanilla ice cream cone. Plus I feel a fullness in my uterus, if that makes sense, and some cramping as well. Not to mention the headaches. I thought it was from caffeine and that maybe i was getting ready to start my cycle but then I realized it was still 2 weeks away. I've only started noticing these symptoms in the last couple of days. I went online and did a pregnancy calculator and my "ovulation date" coinsides with me having these symptoms within a few days of possible fertilization. So is it possible that I could be pregnant? And have my odds of pregnancy increased because my tubal was so long ago?