25 DAYS LATE!!!

My period is 25 days late and i am freaking out!! Idk what to do. Back in January i had a normal period and then i didnt get a period in February it came the beginning of march and lasted a whole 14 days and i havent gotten one since i had my tubes tied june of 2014 so theres no way i could be pregnant.... right? Idk the only other time i missed a period is when i was pregnant..