Late!!

Just a little curious, my period is 2 days late and I haven't had any symptoms of starting.. I've taken a couple pregnancy tests, one the day my period was supposed to start, one yesterday and one today. All negative. So I'm not sure that if I AM, and I keep getting false negatives or what the case is. Just wondering if I should keep doing tests every other day or so or what I should look out for. Any help is appreciated!!