Missed 4 birth control pills in a month, what are my chances of getting pregnant?

I missed 4 pills this month. One on the 7th, and had unprotected sex, one on the 23rd and 24th and had unprotected sex on the 25 and then one on the 30th and had unprotected sex on the 29th. Very curious. I have heard it depends on how many pills you miss during each week of your pack. I never took the pill I just threw them away. 

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