I got my tubes tied when I was 33 years old, right after the birth of my daughter. She was my third child, and even though I wasn't entirely sure that I was "done" with the whole baby-making thing, I knew that my husband and I couldn't handle any more.
I became pregnant the first time while I was on birth control. I did not know that antibiotics and birth control didn't like each other, and I unwittingly asked them to play nicely. They didn't; the antibiotics won, and I found myself in an ER in the middle of the night, writhing from the sharp pain of a kidney infection, and thinking that surely I was hallucinating when the nurse told me that I was six weeks along.