Safe Period To Avoid Pregnancy

I want to calculate the safe period to avoid unwanted pregnancies.

simple method of calculation is
day of ovulation due date minus 14 =, the life of sperm is 4 days
guess ur due date is December 20, the date of ovulation December 5 December 2 to 10, so is fertile period
rest is sure to have 100 percent safe

Here use this http://www.babycenter.com/ovulation-calc ... when he tells the best chance of getting pregnant so just avoid sex around those days

http://www.babyhopes.com/ovulation-calendar.html
http://www.firstresponse.com/ov.asp?gclid=CN2q17yEt54CFRQeDQod8x-EnQ

they are supposed to be planning to have children, but it belongs to the same cause ... simply reversed

Safe period and pregnancy

What follows is the best and safe method to avoid pregnancy: -
First, one must know the cycle, ie the first day of last menstrual bleeding the first day of menstrual bleeding present. It is the length of the menstrual cycle.

This period varies from person to person and is usually between 26-31 days.

Ovulation occurs approximately mid-cycle, the cycle to say - (minus) 14 days (this varies also).

A week before and one week after the approximate day of ovulation is considered fertile period.

The days apart from the so-called periods of high, when fertilization does not occur.

So, to calculate the safe period, you must know the fertile period.

Calculation of fertile period: The shortest cycle minus 18 days = 1st day of fertile period. The longest cycle minus 10 days = last day of the fertile period.

Ex: if a women's menstrual cycle varies from 26 days to 31 days of the cycle,
The shortest cycle [26 days] = minus18days 8th day.
The [longest cycle of 31 days] = 10 days less 21st day.

Thus, 8th to 21st day of each cycle counting the first day of the menstrual cycle is considered as fertile period.

Period other than this fertile period in a menstrual cycle is considered safe period.

If you want to avoid pregnancy to avoid intercourse during the fertile period. safety period is safe for sexual activity.

Hun I hate being the bearer of bad news, but there are no women time.a security may even become its Prego Period2 weeks after your period if u IAVE a cycle of 28 days ur considered most fertile want though.you perhaps take on British Columbia, if you do not want to become prego.make research.and you good luck