Can I trust this test?!

So I usually get my period around the 24th-26th of the month, but I still haven't gotten mine and we've been trying for about 4 months so far. All of the tests I've taken have been negative and today I grabbed the Walmart brand early response test since it was the only one there. I see a faint line, but I've heard bad things about blue dye tests. Do you think this could be my month? The wait is killing me!