I was a forgotten diaphragm.
My mom was pretty open about telling me the details of my origin when I was little. My parents got married when my mom was 3 months pregnant. Years later when I was going through some stuff from a storage locker I found the letter she wrote to my paternal grandfather refusing to have the abortion he was offering to pay for and ardently professing her love for my father and desire to do the right thing by having the baby. It was very touching.