Clear blue digital test

I took a test with the clear blue digital test and it came up with the book symbol, which in the directions it says either too much urine or it didn't get laying flat right away. So I was going to toss it and try again, but 3 mins later it showed up pregnant. So I was kinda excited, but I don't know if it is true. I know I should re test, but has this happened to anyone else and it come up correct??