Honestly...if you lead a healthy life style, I would strongly recommend waiting as LONG as you can before you take another test.
Everyone thinks that finding out so early is this wonderful thing, but I tend to disagree...
1) Pregnancy is closer to 10 months from conception to birth, 9 months around the time you might find out, 8 months before you're really sure...Pregnancy can seem like it's taking FOREVER, especially if you're prone to morning sickness, backaches, etc...and once you *know* you're pregnant, you will be hyper-aware of every nuance of your body...every twinge will scare the hell out of you, every ache will make you worry...Enjoy some of the down time of not having to freak out about everything, I say.
2) Also, and I admit that I'm a little skeptical because I've suffered two miscarriages in the past year, but I generally feel this way anyway...(and I've had 3 successful pregnancies, so I'm pretty versed in this pregnancy stuff)...The thing is, if there are going to be any troubles with the pregnancy or the potential for miscarriage--you are usually the most susceptable to problems in the first trimester. Women finding out they're pregnant so much earlier now really creates this space for a lot of heartache and disappointment that didn't always exist. Used to be a woman could be 4-6 weeks pregnant, not know it, miscarry and only think it was a late or heavy period...I'm not being callous, honestly...Just, having been through 2 miscarriages recently--and being FULLY aware because I found out I was pregnant around wk 5, I think I'd rather not know that early...
Anyway...It's stuck in your head now, so you'll be thinking about it...but if you're not pregnant, give yourself a little break before finding out next time you think it's a possibility...that's my advice.
Good luck with your trying.