Because they go around and around and around:
I am a scientist. I like to live in an evidence-based reality. I need numbers, charts, and graphs. I like to make quantitative comparisons. So now I have year's worth of patterns to analyse.
I seem to be ovulating. While my follicular phase is a little variable, my luteal phase seems to relatively long and consistent. But I don't know anything else about my body. Are my eggs getting lost? Are my tubes blocked? Is my mucus or lining sub-standard?
Once again, just waiting for a diagnosis.
Always waiting, waiting...