Hi! I'm trying for baby #3 now lets go back to Dec of 2013 I just happen to come across a app on my phone thats suppose to tell you when you are O so it said I'll O on Dec 9 I took that & ran with it & me & my husband BD lol ok my Af was due Dec 23rd didn't show Dec 24th didn't show so on Dec 25th I took a HPT it was positive yayyyyy lol, on March 10th I MC :( no Af in April my first next Af was May 12th, then June 10th, July 12th, Aug 10th, Sept 8th, Oct 9th now as you can see my periods vary from month to month it's not a constant (28 or 29 day cycle) so how would I determine about when in the month I will O? Can someone help me please I'm trying for my lil princess!! Thanks