Possibility ????

Hello. Im new to the site and I’m very anxious and confused. I have 4 children who’s ages range from 6 to 17. I have 3 girls & 1 boy. My son’s the youngest and i tied my tubes in 2000 after i had him. My periods late now 12 days. I took a test but it was negative. What are the possibilities of me being pregnant? I usually get menstrual back cramps and tender breast a few days before my menstrual. I haven’t gotten any symptoms. Could i be pregnant & maybe just need a blood test or is this just wishful thinking? Please help , Im going crazy!!!!!!!