Can a girl get pregnant after 2 week of finishing her period ?
If you mean "Can a girl get pregnant by having sex after 2 week of finishing her period?", then the answer is that it is possible, depending on the length of her cycle and the length of her period.
For instance, if she had a 4-day period and had sex on cycle day 18 (14 days after period ended), then with a 31-day cycle, ovulation could have occurred on that same day (CD18), and pregnancy could follow.