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Regarding your question,

What is fertile days

It is a group of days at which pregnancy chance is the highest during menstrual cycle. Regular menses is about 28 days and fertile days are the following

• Ovulation day which is 14 days before the first days of next  expected menstrual cycle
• 3 - 4 days before the ovulation day
• Thus, based on your wife dates the fertile days are 9, 10, 11 and 12 of August where pregnancy chance is high if sexual intercourse was done.

When can i get pregnancy

Based on your question, there is a chance of pregnancy to occur if sexual intercourse was done at any time if menstrual cycle but is highest if occurred during fertile days which i explained above
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