I've been trying to get pregnant for a few months now. My period was due today so I took a pregnancy test which says it can be used from 3 days before your period is due. On previous tests over the last few months it has been clearly negative. You can watch a slightly pink saturation line travel along the window revealing the first line and normally it travels to the end and a second line doesn't appear within the five minutes so therefore I can see the test is negative. Today I watched the saturation line travel along the window to reveal the first line and then it travelled along to the end. I was watching the window when suddenly a very faint second line began to appear. This was almost right away! I couldn't believe it. It was much lighter than the other line but it was definitely there and stayed like that for another few minutes and then it started to fade away and after about ten minutes it had completely disappeared. When I tested positive with my first baby the pregnancy test was very clear and the second line very visible. Today when I did the test I didn't use the first morning urine but instead did the test around mid morning after I had been drinking coffee. Do you think I could be pregnant? Is it possible that a positive line could just disappear?