What's the likelihood of me getting pregnant?

M
I've taken birth control pills for the last 5 years. I'm on the fourth day of my placebos right now, and my bf and I had unprotected sex (he pulled out but came a little inside me). I'm supposed to get my period tomorrow. I take my pill mostly at the same time every day. My "time" is 4:00 PM, but I usually take it between 4-7 PM, sometimes as late as 9 PM. I haven't missed a pill in nearly 2 years. My bf has finished in my many times in the past and it was fine. Should I be worried right now though? Since I'm on my placebos? He hasn't ever finished in me on my placebo pills, I don't think. I've read that the placebos are just as protective as the other pills, but how protected do you think I am? 
*edit; he came in me today (on my placebos) 

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