How long should I wait to take another test???

I was 3 days late for my period, so I took a test! It didn't show positive right away (3min). The next day I looked at the test for kicks, and it showed a very very very light positive! Since I hadn't pee'd yet that morning which turned positive. I wanted to be absolutely sure before I mentioned anything to my husband - so I took one more test the next morning (today) and it was negative.  How many days should I wait before taking another test - assuming I don't end up with my period by some miracle first????