Q- pregnancy concern with the pill. How accurate is it?

So basically I have been on the pill since October 2014 and I'm not the most regular of takers. I usually stick to 8:30pm but sometimes I forget and it can be an hour to three hours late.
My question is I had sex with my boyfriend today and a little bit of ejaculate leaked out from the rim of the condom and I took my pill at 11:30pm last night. Am I at risk of pregnancy?

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