I recommend you use the calendar method, the natural way, and if you want to have sex or not, use the Persona monitor, if you can afford.

-quote-

"Before using the calendar method, a woman has to make a detailed note of her periods for six months. Each month, you should note the number of days between starting one period and the next. Then work out the longest and the shortest interval between your periods. Now you are ready to start calculating.

It can be hard to do it correctly and you will need a pen and paper. From the shortest interval you always subtract 18 days. If for example, the shortest time between starting one period and the next during the last six months was 27 days, by subtracting 18, you arrive at the 9th day after the start of your period.

From the longest interval you always subtract 11 days. For instance if the longest space between starting periods was 31 days, subtract 11 to arrive at the 20th day after the start of your period. Using the figures in this example, the first safe phase would be from day one to day eight, the phase when conception is most likely to occur would be between day 9 and day 20 and the second safe phase would be from day 21 to the start of your next period. Please note that these figures are an example only and you will need to do your own calculations to work out your own fertile and less fertile phases.

The Persona monitor was introduced into Britain in the 1990s. It’s basically a device that tests your urine strips regularly – and then shines a green light for ‘go ahead’ or a red light for ‘don’t have sex’.

It currently costs about £60. You would also need to buy new urine test strips regularly, at about £10 per pack."

-end of quote-
Source(s):
http://www.netdoctor.co.uk/health_advice/facts/naturalfamilyplanning.htm

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Friend every girls had their own monthly cycle. Monthly cycle is that in which start from egg generation and then egg will get it full maturity at 15 days and then that egg started to degrade and it will destroyed and came as blood through urine the period at which the egg destroyed and came as blood at that time one should not have sex contact with her. After fully destroy of egg then again new egg is formed the cycle continues. The perfect day for having sex is that 15th day from generation of egg.
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