period due yesterday

period was due yesterday, I've been having light cramps for more than a week but it hasn't gotten worse just uncomfortable. nothing still today, I'm regular on a 28-27 day cycle. once I got my period the day after it was actually due so I waited till today and still nothing. breasts are sore still as well since after I ovulated. gonna wait till Friday to pick up a test IF my period doesn't show of course