After releasing two egg. One is fertilized. And...

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How many ovums are usually released ?
usually ,one ovum is relased during one period 
What happen to not-fertilizied ovum ?
in this case , the not fertilizied ovum will be discharged from uterine with vaginal discharge , with no effecting on the fertilizied ovum which will continue to grow into the uterine 
Can non-fertilizied ovum be implanted into uterine and continue growing ?
its possible , but rare 
How to know ovulation days and the safe days in period :
1. ovualtion time or the time ovum exist are the first 4 days of the last 16 days of the period , for example ;if your period is 28 days , and  if your first day of period was 1st/9 , your ovulation time is 12th-16th /9 
2. ovums last 48 hours in the uterus and can get fertilized any time during this period of time 
3. male semen last up to 5 days in female uterus and will be able to fertilize during this period of time , but the earlier the better 
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