HELP!!!!

So my period was 5 days late this month(should've started oct 26 didn't start til October 31) which led me to take a pregnancy test which came up negative. My period finally showed up and now that it did its abnormally light...I'm usually soaking through the supers every couple hours. And lately have only needed one or two regulars a day(plus occasional pad). Is there any chance I'm pregnant or is this normal?? I'm 20 almost 21