test now ? or wait ?

Amanda
i know its better to test first thing in the morning , so i was going to wait and test tomorrow morning .. i been trying to concieve and have had little cramping the last week here and there , today would make 3 weeks 2 days pregnant if i am , my period is due in a week exactly from today and im already 8dpo .. i have a digital first response pregnancy test that says i can test upto 6 days before i miss my period .. what do you guys think ?