Line comes then disappears?

Johnna
I don't have a picture of my test. but I'm almost 2 weeks late and have no symptoms of af or pregnancy. I took a test and it came up negative, so I waited a couple days and took another test. there were two lines at first but the test line just kinda disappeared?? I'm always spot on down to the day of my period when it starts and I'm so confused right now.. Need help!!