Genetically I have irregular cycles and they range from 29 to 37 days. I don't believe in theory that "14 days before next period I will ovulate" because I don't know when I will get my next period! It is also hard to use ovulation tests between periods and check every day or check your temperature and fill out the log everyday. So how can I know when I should try in order to conceive? My last cycle started on September 16.

Fertile days Resulting due date
November 4, 2013 - November 9, 2013 July 31, 2014
December 7, 2013 - December 12, 2013 September 2, 2014
January 9, 2014 - January 14, 2014 October 5, 2014
February 11, 2014 - February 16, 2014 November 7, 2014
March 16, 2014 - March 21, 2014 December 10, 2014
April 18, 2014 - April 23, 2014 January 12, 2015

Try there days. Or maybe try an ovulation kit from the drug store. Good luck!