So do what you want with what I am about to say, but my doctor recently advised me NOT to test before I missed my period and if I could wait until a week after that would be best - emotionally. I have lost 2 pregnancies at 5 and 6 weeks, and she said that knowing as early as I did made the loss even greater. After 6 weeks, and then every week after that chances for miscarriage or chemical pregnancy decrease.
If you are someone who would be devastated by a m/c (not that anyone is ever much less than that) consider waiting until your body knows for sure what's going on.
Happy testing and hoping you get your BFP and a healthy 9 months after that!