When should I take another test?

Search for a local clinic. They give them for no more than $5 or even FREE. If you don't have luck, wait about another week and make sure you take it first thing in the morning. From my experience, all tests work, no matter what the cost, but the cheaper ones are easier to mess up and get a false result. Go to walmart. They have one called Equate and it's very accurate. It costs about $3-4. Absolutely no more than $5!! Good luck!