Missed period!

Help!! Its day 2 and my period has still not showed up! I took 2 pregnancy test last week. I took one that came out positive, then later that night took another but came out negative, i thought maybe it was still to early to tell. But now that i havent got my period im starting to believe i am. But im wondering is it too early to tell if i am , or should i wait to see if my period doesnt come at all?! Btw i have NEVER once been late !!!!!