Is it possible I could be pregnant?

Im 11 days late for my period. My boyfriend has only you-know-what inside me once and that was sometime in the second week of October. Im on the pill Cerazette and have only missed taking it once, but that was after my boyfriend you know. I took a test yesterday and it showed a negative result. I've been incredibly hungry the past 3 days, no matter what I eat. My boobs are starting to hurt and I keep getting little pains in my lower abdomen, and I have a fair amount of white discharge (sorry if TMI!). Could I still be pregnant?
Is it possible I could be pregnant?
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