Integrating lifelogging data sources for insights into…..fertility?

I’ve always argued that the power of lifelogging was not in just collecting one data item, but in finding patterns in several items that could not otherwise be detected without technology, however this is one application that I had not expected:

http://techcrunch.com/2013/05/09/big-data-based-fertility-tracker-ovuline-now-integrates-with-fitbit-other-quantified-self-devices-will-support-pregnancy-tracking-too/