It is possible yes. 8 days is a long time to not be taking the pill and pretty much ensures that the hormone is no longer present. Taking the pill the day after unprotected sex will not protect you from the day before. I'm not exactly sure what effect continuing the pill would have if you are pregnant, but all packages say "Do not take this if you are pregnant" so I assume it can't be 100% healthy for a fetus.
2 weeks is still a bit too early and an at home pregnancy test may have trouble detecting the hormone in urine. I would wait till you miss your period.
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The one that strikes the first blow
Admits they've lost.