Pregnancy tests

Anyone have some suggestions on the brand of pregnancy tests that are are best? I took a e.p.t. Brand and got a negative. But I strongly feel that I am pregnant as I have so many symptoms and I have that gut feeling. I'm going to take another test tomorrow morning so I want one that is reliable, because if I am pregnant I would be about 6 weeks. So by this time it should say positive right?  Maybe it's all in my head but I want to do one or two more tests to make sure.