Go get a home test, better yet get 2 or 3. If you are almost 8 weeks LATE and they read negative then you are more than likely NOT pregnant. If any of them are positive, you more than likely ARE pregnant and need to get some prenatal care asap.
Either way, going 8 weeks without a period is not normal for most women. If your periods are usually normal then you need to see a doctor to find out what has messed up your cycle.