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Original poster

Confused about false positives?

33 replies

ElizRoz92 · 20/08/2023 10:30

I'm 10DPO. Yesterday I took 2 Clear Blue tests and both had faint positive. I felt happy but then read online they're notorious for giving false positives? I went out and bought a boots and Tesco test.L and tested them with first wee this morning. Both came back negative. I then tried my clear blue again (as I have a whole pack). Again another faint blue line.... i don't know if they're all false positives?

Confused about false positives?
Confused about false positives?
OP posts:
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Stephy1024 · 20/08/2023 10:34

Was the clearblue positive within the time frame? And was the other pregnancy tests an early detection one? These look like a positive to me and not an evaporation line.

CR7 · 20/08/2023 10:37

@ElizRoz92 providing you follow ALL the instructions branded tests are great.

Evaporation lines form after the time limit.

Wishing you lots of luck x

Original poster
ElizRoz92 · 20/08/2023 10:43

Stephy1024 · 20/08/2023 10:34

Was the clearblue positive within the time frame? And was the other pregnancy tests an early detection one? These look like a positive to me and not an evaporation line.

These came up within a minute of taking the test

OP posts:
CR7 · 20/08/2023 10:56

@ElizRoz92 great news! Mine were very quick also x

noaddedsugarx · 20/08/2023 10:56

I wouldn’t trust these tests at all! They’re notorious for false positives and shouldn’t allowed to be sold. However I do think the line has a thickness and some colour to it which is a good sign especially if it came up within the time limit. Were the pink dye tests just as sensitive? You’re still really early days so I’d probs wait a day or two and test again with pink dye. Lots of luck!

Olivia199 · 20/08/2023 11:01

The tesco tests are a 25miu sensitivity and I believe these clear blue ones are 10, so more likely to pick up the early positive. Unsure on the boots one. The books early result are brilliant and I'd highly recommend checking with that! Got everything crossed for you.

Original poster
ElizRoz92 · 20/08/2023 11:08

Olivia199 · 20/08/2023 11:01

The tesco tests are a 25miu sensitivity and I believe these clear blue ones are 10, so more likely to pick up the early positive. Unsure on the boots one. The books early result are brilliant and I'd highly recommend checking with that! Got everything crossed for you.

Yeah the boots and Tesco ones were not labelled as early response. And instructions say to use from missed period so that could be it!

OP posts:
Olivia199 · 20/08/2023 11:18

Ah sounds like just the normal boots ones then which are also 25. I got a positive on a 10 at day 10 then a positive on a 25 on day 12. Good luck!

Mummaof1boyx · 20/08/2023 11:30

Hi, exactly same boat here. Got this faint line on clear blue but negative on tesco 25mu one

Confused about false positives?
Mummaof1boyx · 20/08/2023 11:32

Mine came up with a faint line within about 1 minute of testing, so it’s unlikely it’s an evap. Still stressed though as they are notoriously bad for evap lines and how the 25mu tesco one came back negative this morning!

Original poster
ElizRoz92 · 20/08/2023 11:42

Mummaof1boyx · 20/08/2023 11:32

Mine came up with a faint line within about 1 minute of testing, so it’s unlikely it’s an evap. Still stressed though as they are notoriously bad for evap lines and how the 25mu tesco one came back negative this morning!

I've just checked the box for the boots and Tesco one and another commenter was correct in that they require 25ml of HCG to register a positive whereas these clear blue ones only need 10ml. We might just be too early for the others! Fingers crossed 🤞🏻

OP posts:
Alyosha · 20/08/2023 11:45

They're not false positives so much as evaporation lines that look really real. If it was clear and appeared in the timeframe in the right place it's probably real.

They are also bad for dye runs hence making sure the line looked normal and was in right place.

OTOH chemical pregnancies are very common and often present as a singular positive test at 9/10/11 dpo followed by negative tests and your period at its normal time or slightly late.

Original poster
ElizRoz92 · 20/08/2023 11:47

Alyosha · 20/08/2023 11:45

They're not false positives so much as evaporation lines that look really real. If it was clear and appeared in the timeframe in the right place it's probably real.

They are also bad for dye runs hence making sure the line looked normal and was in right place.

OTOH chemical pregnancies are very common and often present as a singular positive test at 9/10/11 dpo followed by negative tests and your period at its normal time or slightly late.

These tests have 1 simple job to do! 🙈

OP posts:
Mummaof1boyx · 20/08/2023 11:51

ElizRoz92 · 20/08/2023 11:42

I've just checked the box for the boots and Tesco one and another commenter was correct in that they require 25ml of HCG to register a positive whereas these clear blue ones only need 10ml. We might just be too early for the others! Fingers crossed 🤞🏻

Show quote history

I agree! We might just be a little bit too early for the others! I will update you as soon/if I get a positive on a 25ml. I think you’ll get one a little quicker as your line is darker than mine! X

Alyosha · 20/08/2023 12:17

Yeah, and the blue ones aren't good at it, I recommend a pink dye test

wavecatcher · 20/08/2023 12:24

Pink dye tests are the most reliable, get a first response

hopefulmum46 · 20/08/2023 12:24

I had a false positive on one of the blue dye clear blue ones and the line definitely came up within the time frame. I'd try a First Response or Easy@Home, I've found them much more reliable, done loads of testing with them and never had an incorrect result, they're very sensitive as well.

Mammma91 · 20/08/2023 12:26

Op I had a very similar test and now in hospital on an 8 week pregnancy (sickness related, but don’t worry I’m just poor at being pregnant 😂). Tescos one £3.50 own brand are fab, I used them when I found out I was pregnant with my son 5 years ago and again this time it confirmed it after clear blue. Could you try a cheaper brand test?

Alyosha · 20/08/2023 13:01

False positives are often chemical pregnancies though if the line was clear, normal, came in the timeframe etc. But yes, blue tests are notorious for evaps that happen really quickly, dye runs etc. Etc.

Original poster
ElizRoz92 · 21/08/2023 04:26

Mummaof1boyx · 20/08/2023 11:32

Mine came up with a faint line within about 1 minute of testing, so it’s unlikely it’s an evap. Still stressed though as they are notoriously bad for evap lines and how the 25mu tesco one came back negative this morning!

BFP Today 11DPO on a digital! I also got another vfl on the other one! I'm allowing myself to feel excited now! Sending you lots of luck! Xx

Confused about false positives?
OP posts:
Original poster
ElizRoz92 · 21/08/2023 04:36

CR7 · 20/08/2023 10:56

@ElizRoz92 great news! Mine were very quick also x

BFP today! ☺️

OP posts:
noaddedsugarx · 21/08/2023 08:02

Yay! Congrats on your pregnancy OP :)

Olivia199 · 21/08/2023 08:41

Horray! Congratulations OP, lovely news.

Stephy1024 · 21/08/2023 10:59

Wonderful. Congrats OP. 👶😊

Olika · 21/08/2023 11:32

Congrats! The first pic def had right kind of line which we now know was correct. FlowersSmile

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