Ovulation very curiouse!! Help ladies

[Do2na140]

Ok well I am currently 23 weeks pregnant and happy just have a question about when could I have ovulated. I had written down 2 periods prior to getting pregnant and they go like this: I had a period on September 9,2011 and the next was on October 20, 2011. I found out i was pregnant on November 28,2011 they told me I was about 5 weeks. Now my question is WHEN IN OCTOBER DID I OVULATE!? And when could I have fallen pregnant. I would appreciate any help

 

[sg0720]

are your cycles usually around 40days long?

check this out: does it look about accurate? this is going off your LMP

https://www.babycenter.com/pregnancy-due-date-calculator?sub=true&lmp=true&month=9&day=20&year=2011