5 days late ? negative test

My period is clock work over never missed one ever that I can remember, I'm 5 days late according to eve, it uslaly off by a day or 2 but never this much, I'm sexually actively but use protection every time an never had  one break that I know of, my period was supposed  to start Sunday but it's Friday AN still no  signs of af, I took a test Tuesday an it was negative, I don't have pregnancy symptoms or really af ones either... could I still be pregnant ?