I had a sex with my gf but we use precaution while having sex. And she is not having period of this month. But the thing is when we had a sex last month I gave her unwanted 72 and she had a period in her normal date after that again she had a period for 12 to 13 days but now this month she has a date of his period which is 6th august but today is 10 august she doesn't have is period. So is there any chance of pregnancy?