I am 24 years old. I have been on the Depo shot for 3 years but normally everytime its time for me to get my next shot I always get a period. Last month I just Had minor spotting and it stopped after two days, I was scheduled to get my shot between march 1-20 and I didn t go, I took a pregnancy test and it came back negative but I still have been getting some symptoms such as breast tendernest, my nipples are sore and always hard, always tired and sleepy, frequent urination, cravings and light headedness and I have some mild cramps from time to time what does this mean?