When can I procure pregnant base stale of this?

I started my period on May 23,June 16, and July 18 I have been on copious websites trying to figure out when my ovulation date would be but the days in my cycle vary so much I cant enlighten. I would have thought for sure that I would be pregnant now but i'm not he has kids and I hold a son so I know we are both capable any suggestions or advice serious answers only please
Answers:    I read on one trellis site ( sorry I cannot remember where) that you can take your longest cycle - 33days from june to july - and subtract 14 ( because most women ovulate 14 days before their next spell regardless of the length of their cycle) = day 19 and then lug your shortest cycle - 24 days from may to june = day 10. This means your fertile time is between day 10 and sunshine 19 so it would be best to have sex during this time frame. The web site said to chart for a year and then do the math so if you enjoy dates of your cycles before May you can figure it out to see if the date differ at all.

Sorry I can't remember the web site, but I hope this might help you.

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