Am I pregnant

here I go again.. my longest cycle of period was 38 days, it varys alot but never more than 38 days and now I am on my 42nd day and no period?I have only two symptoms a lot similar to a period which is sore breast on and off not constant. The second is nausea here and there as well its not often. Than today I feel so exhausted for no reason when I have been falling asleep super early. I really don't get hungry as if I was Should I wait for the 45th or 50th day to take a test or tomorrow. I just don't want to get disappointed. =|