Period & exact conferral date?

how can Doctors predict the exact delivery date if they presently the date of mensesPeriod & exact conferral date?
Because doctors have no method of knowing when exactly you ovulated or conceived, they estimate that you'll give birth 40 weeks after your end period. This is one and only an estimate, of course. Some women can enjoy healthy full-term babies at 36 weeks, others don't donate birth until 42 weeks, the majority of women have theirs somewhere within between.
its never exact unles your have your cycles and date all to a "t" even later its never certain nearby are many factor to change it
doctors voice this as edd (expected date of delivery) so there is no exact one here, it is calculated by tally 7 days from the last date of menstrual cycle plus 9months give the edd. They r adding 7days because ovulation starts one week after the ending date of menstrual cycle
Count 280 days from the onset of the ultimate menses.

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