Can I get pregnant if a took my birth control 2 hours late?

My usual time is 8:30pm but if I have a night shift which is 3 times a week, I sometimes took it 10 or 9:30. So which means I took my pills in a different time everynight with the cycle of 8:30-10. (Mond 8:30 Tues 10 wed 8:30 thurs 9:30 and so on..) it can affect the effectiveness of the pill??
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