Disappearing line and end result?

🌸 Crystal 🌸 • Sat, Jul 11 • TTC #1 since January 2014

I broke down and took a test, AF due in 3 days. The package says that you can read a positive as soon as the test line comes up. We'll it came up, then after 2 minutes disappeared. I'll test again tomorrow, but has this happened to anyone? If so what was the result?

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