QUOTE(ati radeon @ Apr 13 2011, 12:19 AM)
the egg should not be in uterus anymore after menses, am i right? the day after period ended to roughly day 13-15 is non-fertile period (well to make it safe day 10

its just a rough estimate). if sexual intercourse happen in the period the pills are not needed unless the couple wants to ohm ohm all the time. It is only required after she ovulated (2 weeks after menses) and till before her menses come.
mate dont understand you here. menses is when the blood is flow out and etc...so for sure the eggs are not there already.
wat do you mean after the period ended there is a roughly 13 - 15 days of non-fertile period??

we are talking about human cycle here ah...not some animals ah.

after the period ended there is roughly 2 - 3 safe days..after which you should refrain from unprotected intercourse. Fertility usually or normally happens 6 - 7 days after the period ended. Giving the nature of sperm, under these ideal conditon, it could live for 3 - 7 days. So that is why you stop after 2 days..
The Fertility period last for about 7 - 8 days.
2 weeks after the menses is also the safe period..but it is always best to give 15 - 18 days after menses to have free sex.
Again, this is all depending on the ladies, different ladies have different clock works. Some of them have a predictable menses cycle, and you can use an ovulation calendar to monitor her fertile and non fertile period. Others their menses cycle is totally unpredictable. So before you want to use the ovulation calendar, it will be best to monitor her period cycle for 2 months. Wear a dom dom during these period.