We had unprotected sex on 26th September 2014 at 1.00am that is at night after 12 o'clock of 25th September. I finished inside! Her period cycle varies from 23 to 29 days, for last more than six periods, with an average of 26 days calculated by a smartphone app.
She did take Plan B, called Unwanted 72 in India, on 26th September 2014 morning.
If the calculations for last several periods is to believe, she might have ovulated somewhere between 13th to 18th September 2014. Her last period length was 25 days with menstruation beginning on 3rd September 2014.
Thank you so much for your time and expertise.