I don't know but I am really excited now , I am 18 and been tracking my period for 3 months ! It was supposed to come today and usually it comes in the morning , I cramped some days before today but all what came out was a kind of implantation bleeding like something pink and usually my period is red kinda vine ... My period is pretty regular and is never not even one day late , if it does not come today ... Should I get my hopes up ?? What do you guys think ?? Or maybe should I wait 3 to 5 days to get a pregnancy test ??