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Look at the amount of hcg levels each test picks up, some tests can pick up from lower levels of hcg like 10mIU/ml and some wont pick up hcg till the levels are at 25. Im just thinking without getting ur hopes up to much like but i cant see why you would get a bfp if hcg wasnt present at all. Try again with fmu Good luck hun xx

I have never used a blue dye test until a few months ago, it was a target brand 'up and up' early detection test. I got a clear blue line. I immediately after used other pink dye tests including first response, all of which we're negative. I had always heard bad things about the blue dye, but just wanted to try a cheap test. Never again. I then researched my specific test and found alot of the same complaints, including a woman who got her positive from her fish tank water with that test.

Stick to pink. Wait a couple days (if you can, I can't ;) and try a dollar tree test, people like those. I've been pregnant 6 times and never have experienced a false positive on any test until the blue dye. My period came right on time to the day also. Good luck. :)

Thanks for your replies :) I'm going to test again with FMU and deff stick to a pink dye test.