2nd line

Bit confused . I am due on fri 17th. I feel different and took a few test all neg too early to test. 
​So today I did a "clear and simple" test  and a second faint line came up in test area. Is the any chance the test is wrong as I'm not due on for few days. I want to scream in excitement but part of me is on disbelief. I wish my husband would hurry home from work!!!!