1 Subtract eleven days from the total number of days to find the last fertile day in your cycle. 2  For example, if your longest cycle lasted 31 days, your last potentially fertile day in each cycle would be the 20th day in the cycle (31 - 11 = 20).
Why you shouldnât work up until your due date. I nearly gave birth to my son at work. Right there on the third floor of the sea foam-green AAA building on Van Ness Avenue, where I was working at the time. Luckily, my coworker Nino convinced me to go to the hospital when I told him that I was feeling crampy.
Quick Answer. A woman can estimate her due date with an ultrasound, by measuring the size of the uterus or by determining the first day of her last menstrual cycle, states WebMD. The average pregnancy due date falls 40 weeks after the first day of the womanâs last menstrual cycle. Continue Reading.