Hi Maria,
I agree with Charles, you should just go ahead and use it.
If this test still bothers you then get a proper professional test done – I think these self test kits are a bit of a gimmick personally and no substitute for a proper professional test. Your crops will soon let you know if there is a serious problem.
Wait until the end of the season and then consider getting your soil tested properly, its really great information to have.
Don.