Do all blue tests eventually have evaporation lines?

[merut13]

I had very light spotting at DPO-9. Since then I have been testing daily and getting BFN.

Yesterday, at DPO 12, I tested with six different brands in the afternoon with the same sample. They were all negative. I saved them and when I looked at them this morning, all the blue ones (excluding the $1 test) were very faintly positive.

I tested again this morning (DPO 13), all negative. This time I threw them all away. I feel like I should have a positive the day before my period if I am pregnant. Do all blue tests eventually have evaporation lines? The first response did not change to positive at all.

 

[lisap2008]

In my experience yes looking at them after their dry I can always see a faint positive so I dont buy them anymore. If its a real positive it will show up in the time limit but sometimes the blue dyes can give false positives either way.

 

[NoodleHelm]

No tests should be read after the time limit on the package. Whether blue or pink dye. Once the dry, they do have an indent line where they dye would have been.

If it is positive, it will be positive in the time limit. However, blue dyes are known for evaps during the time limit.

For me, if it isn't blaring positive then I won't believe it.

 

[cscbeth8421]

i have never heard anything good about a blue dye test. Perhaps try some cheapies from amazon? or dollar store cheapies?

 

[NoodleHelm]

i have never heard anything good about a blue dye test. Perhaps try some cheapies from amazon? or dollar store cheapies?

This too! I just got 50 wondfos from amazon for 11.99 --> Can't beat that!