Confused, need answers.?

I had my period April 24- May 1st. It was odd. The first two days of my period were spotting then stopped for a day, then continued on until May 1. Now May has passed, and I haven't received my period. My question really is, would I have gotten my period May, beings Aprils period ran into a day of Mays, or not? And should I be worried about being pregnant. I have no symptoms, excepts nausea sometimes, but that is it. My periods come every 30-32 never anything longer.