is a fading test normal?

I'm 5 days late today (Fri) and took 3 tests on Wednesday (morning, afternoon & night). All came up positive but the first two faded a bit but the last one hasn't. is this normal? I've read that clear blue isn't always the best? Will try to get the tests but in Germany and finding it hard to get different brands. thus will be our first and were been trying for 15 months. Thanks for your help!