Moira Weigel Photo: (Supplied)
The self tracking movement uses sensor technology to measure and record your body and how it is performing.
Until now this has tended to focus on activity levels; how many steps you've taken, how far you've run or biked, calories burned versus calories consumed, as well as your heart rate, blood pressure and blood sugar levels.
Tracking a woman's menstrual cycle to establish when she is fertile has not really featured in many of the app stores until recently, according to Moira Weigel.
She's been looking at the latest fertility tracking apps on the market and when fertility tracking started.
Example of a basal body temperature chart. Menstruation begins on day 1. The rise in temperature between days 14 and 18 are the indication of ovulation. Photo: By Elizgoiri - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15997511
