Predector done, very pink little line, then nothing more.

Hi,

I have a 25-day cycle, but I calculate it based on 28 days.
My last period was on 17.09.2015.
I took a test today and there was a very faint line. 10 minutes later, I saw nothing more on it, not even a faint line.
It's very weird, so I don't know what to think. They always say a line is a line. If you don't have a pregnancy line, I think you're definitely not pregnant. But there was a faint line visible, and then nothing more.
It's driving me crazy. What symptoms should I expect? More hunger in the evenings, a bit of back pain, nothing in the lower abdomen (at the beginning there was), this morning I had a feeling of nausea but didn't throw up. I really don't know what to think about that line, especially that it disappeared afterwards. A person's body is so weird, you know.
Does anyone have experience with this or what should I think?
Best regards, Nancy