STOMACH TENDERNESS ? ;

Ok first off i want to say i am on the birth control shot i have recently taken my second dose of depo vera ! My first shot i had a good bit of irregular bleeding that came about the end of october then on november the 11th i took my second shot and on the 26th began bleeding again but not nearly as much its more like spotting and most of the the time i do not have any blood on my panties but if i hAVE SEX I WILL BLEED BUT NOT MUCH!! THEN I HAVE TENDERNESS IN MY LOWER LEFT SIDE OF MY STOMACH AND MY BOOBS SOMETIMES BOTHER ME BUT NOT ALL THE TIME ! THIS MAY SOUND SEVERELY INSANE BUT I HAVE TOOK OVER TWENTY PREGNANCY TEST IN THE PAST 2 MONTHS AND THEY ARE ALL NEGETIVE THE REASON I DO THAT IS BECAUSE GOING ON TWO YEARS AGO I HAD TWO ECTOPIC PREGNANCIES AND HAD TO HAVE MY ENTIRE RIGHT TUBE REMOVED AND NOW I ONLY HAVE MY LEFT TUBE LEFT WHICH IS WHERE ALL MY TENDERNESS IS AT!! i WOULD ALSO LIKE TO ADD I KEEP UP WITH MY PAPSMEARS I GET ONE EVERY 6 MTHS AND MY LAST ONE ONLY SHOWED A YEAST INFECTION AND I TREATED IT!! SO MY QUESTION IS DO YOU THINK MY SHOT IS WHAT IS DOING THIS TO ME OR AM I PREGNANT AGAIN SORRY SO LONG BUT IM SCARED