well i don't know if it work but i know about its depend on you rather---let say you have a 28 cycles your chance to get pregnant will be up to 14 days after your last period and you count from the first day of your last period...so it takes from 8 days to 16 days after your period-- you should make your owed calender you should write down when you start to ovulation how long your period last...was it spotting medium-heavy period--this well also help you to get pregnant also... i wish you the best of luck
Not always but they claims it's about 90%
A conception calendar is used to estimate when a baby was conceived. It usually uses the date of a woman's last menstrual period to estimate conception and due date.
The Egyptians developed the first accurate calendar.
very accurate :P
Fertilization usually occurs in 2-3 days. Try out the dog pregnancy calendar (see links below) to follow the development of puppies throughout your dog's pregnancy.
The development of the accurate calender was in 450 B.C.
Our calendar is incompletely inaccurate.
The Mayans
They will start to become pink betweent the 14-21st day after conception. Try this pregnancy calendar for cats: http://www.purrinlot.com/preg.htm
they were just as accurate as the one we use now with 365 days
calendar
Egyptians