Within the span of one year, I underwent four intrauterine inseminations (IUIs) in an attempt to become pregnant. The reproductive endocrinologist who treated me had all the right credentials, plus a high success rate in making many couples happy. More importantly, my uterus appeared healthy, and so did my ovaries. The only thing I had going against me was my age. I was in my late 30s, and the quality of my eggs proved to be the one unknown that made all the difference.