A friend of mine is trying to get pregnant she had sex 10/4,10/6,10/7 her ovulation day was the eighth did she miss her chance of getting pregnant?

Varies...: Ovulation days may vary depending on when her cycle happened and how it has been( usually 2 wks before next) If it was expected to ovulate around those days it could've possibly happened due to the proximity of the calculated days. You just need one egg in order to get pregnant. She should keep track of her period and if there is any irregularity with it the should get pregnancy test.

No: Having sex on the 3 days before ovulation is a good way to get pregnant. That's how people usually get pregnant. No need to think about it now, but if the next normal, regular period does not come (is a week late), then one can do a urine pregnancy test at that time to see if there is a baby on the way. Urine pregnancy tests are sold everywhere.