I've been having pregnancy symptoms but its already time for my period.it came on time but its already the 2nd day and its lighter than it should be.my period is usually 6 or 7 days but it doesn't look as dark as my period usually does.can this be deciudal bleeding?

Could be, or could be your period is just off a bit. If pregnancy is a possibility try a pregnancy test. If negative... give it another week or so and see what happens. Try another test at that time if still no actual period.