What is the best tell-tale sign of an early pregnancy before a missed period?

Is a missed period a sign of pregnancy?  Can a missed period be a sign of pregnancy?  Is missed period definate sign of pregnancy?  First sign of pregnancy before missed period?  Does missed period always is sign of pregnancy?  Is diarreah a sign of pregnancy if missed period?  What is a sign of pregnancy before missed period?  What are sign sof pregnancybesides a missed period?  What is the first sign of pregnancy befor missed period?  Is pain in breast after missed period sign of pregnancy?  Is blurred vision and missed period a sign of pregnancy?  What is the first sign of pregnancy before a missed period?  What are the sign of early pregnancy before a missed period?  What is the biggest sign of pregnancy before a missed period?  If you missed your period for a week is that a sign of pregnancy?  What is the most common symptom of early pregnancy besides missed period?  Has anyone every take a PT before missed period and gotten a postivie sign?  How early can you take a pregnancy test after a missed period and it be correct?  What if there is no missed period but an early one and twice the month is that a sign of pregnancy?  You missed your period but you have the sign of pimples and bruises is that a sign of pregnant?