S.G.
I would wait until you are at least a week late (I know that will seem like an eternity!) before you take another at-home pregnancy test.
For some women tho, at-home tests don't work...like me! During my first pregnancy, I took 2 at-home tests, both said negative, and in fact I was pregnant. I assumed maybe I took them too soon, or did something wrong to show a false-negative. With my second pregnancy (which unfortunately ended in a miscarriage), I took 3 at-home tests, one at 2 days late, one at 3 days late and then a third at a week late...all said negative. But I just had that feeling that I was pregnant. Long story short...call your OBGYN and ask for a blood test. That really is the only 100% guaranteed way to find out for sure. With a blood test, it will measure your HcG levels, even if you are very early in the pregnancy. With my third pregnancy, I just called my doctor right away and asked for a blood test. I told them that at-home tests didn't work for me, and they were more than happy to send me for a blood test. Then you should have the results in a day or two at the most.
Good luck with everything...hope this helps! :)