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Blue Dye False Positives and Negatives

I'm a little stressed out because I took a blue dye test (before I read that blue dyes tend to be bad) and got a negative. Now that I've read usually a good portion of everyone who takes a blue dye test gets a FALSE positive, I'm worried that means my negative is a for sure deal and I'm not pregnant this month. I started crying when I thought of this and hoped maybe I tested too early and was wondering if any other woman took a blue dye that was negative and then turned out to be pregnant or what not?

5 Answers • 11 years ago


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Try a first response test. I was about 9 DPO, took a EPT test and was a very faint positive. Later that afternoon, took a First reponse test and it was clearly positive. Not as dark as the lines typically are but it was obvious. I have tested both days since then and it keeps getting darker! Not sure id this helps but definately try First Response.

11 years ago


I also took a blue dye HPT and got a thin blue line in the test window. I wondered if I was pregnant and two days later the same thing happened on another brand blue dye HPT. A couple days later AF showed up. Try a pink dye HPT.

11 years ago


I got a BFP with a blue dye test on the 11th and spent the evening over the moon ecstatic, crying tears of joy, and even telling my sister I was expecting only to follow it up with 3 negatives the next morning and evening from the same brand (one from the same box). I'm TTC #2 and I was nearly 7 weeks pg before I got a BFP with #1, so I'm not giving up hope just yet for this cycle. I'm almost 3 weeks late and peed a BFN this morning with a FRER. One thing is for CERTAIN, I will NEVER use a blue dye test again EVER! The negatives were that much more devastating after getting a definite blue positive within a couple minutes of taking the test. I wouldn't worry, though, that not getting a false BFP means you're definitely not pg this cycle. It's never over until AF shows! Given my symptoms, I do feel like I am pg and just waiting on the proof, whenever it may come.


16 y/o ds, 9 y/o (blue eyed redhead), 2 y/o , 1 y/o golden ????

11 years ago


I got a false positive on a Target brand blue dye, the kind in the clear casing with 2 parallel lines. It wasn't an evap but a big fat definite blue line--I sent a pic to DBF and my phone sucks, and even he could see the line in such a poor quality photo. Anyway, I took an FRER right after that, another FRER the next morning: both completely negative. AF arrived today. I'm NEVER using blue dye again--not worth the emotional toll at all.

10 years ago


Wanted to add, though, to give you hope, that my cousin got blue dye positives way before her positive FRER, so sometimes those blue dyes are right! Don't give up till AF shows.

10 years ago


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