pregnant after plan b??

I took an emergency contraceptive pill (plan b) then I had unprotected sex around 2 hours later. He didn't finish inside me it only lasted for a couple of seconds. He said he's sure he didn't ejaculate. 
Is it possible that I'm pregnant? 
If so are the chances high? 
Ps. This was two weeks ago and I didn't take another pill after it  

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