Thank you all! I will definitely test again tomorrow. The wait is killing me ... lol :)
I would definitely test again in a day or two. When I was pregnant with my first, I didn't see a line on the test and threw it in a drawer. I looked at it the next day and there was a line there. Low and behold I was pregnant. With this pregnancy I had a similar experience only it was about ten minutes later when I looked again and saw a really faint line. Again it was a positive. Good luck to you :)
FRER isn't notorious for evaporation lines but they have been known to put out "bad batches" before. I would re-test in 2 days with first morning urine. Because the pregnancy hormone doubles every 2-3 days you may have a more accurate result if you are pregnant.
But as the previous commenter said - must be read within 10 minutes so I wouldn't count it as positive whatsoever.
Any result after 10 mins on the test should be digarded. If it wasnt there within the 3-5 mins it is more than likely an evaporation line.