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Conception

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Original poster

false positive CB test

26 replies

lizalou · 27/03/2008 15:44

Thought a line was a line and got a faint but definite positive one on Sunday,then a very faint positive line Tuesday using CB tests.

Took a CB digital yesterday which was negative and hey presto my period arrived 4 days late today. Stopped BF 2 months ago and have had only one period since so that's assuming my cycle is back to 28 days...is this the risk of testing early? Could I have been a little pregnant and then it disapeared?Anyone else had a false positive from CB tests?

OP posts:
Lomond · 27/03/2008 15:52

Hi I think false positives are quite common with clearblue tests, there are some sites which show pictures. There was a thread about it the other day.

I always bought my tests online from access diagnostics, they are very cheap and they do some early detection ones.

Hope you get the result you want soon, good luck.

Original poster
lizalou · 27/03/2008 15:58

Thanks. I didn't know there was a problem with CB and false positives.Will have a look at the Ad website for next month.

Still feeling so sick-have done for two weeks. Maybe to do with my cycle kicking back in after stopping breatfeeding.

OP posts:
Original poster
lizalou · 27/03/2008 15:59

breastfeeding.

OP posts:
Lulumama · 27/03/2008 16:00

i thought you could only get a false negative, not a false positive

the test picks up HcG which is only present in urine if you are pregnant, no?

perhaps a chemical pregnancy?

CaptainKarvol · 27/03/2008 16:01

It is possible too that you had a chemical pregnacy, where the egg implants but only for a very short time, but long enough for you to produce some of the pregnancy hormone the tests detect, then comes away. I had a very faint +ve earlier this week, then my period started yesterday (+ve was a Sainsbury's own brand test).

NoNickname · 27/03/2008 16:01

A line is a line. I think you were pregnant but sadly the pregnancy failed very early on.

NoNickname · 27/03/2008 16:02

Sorry - that sounds very cold - I didn't mean it to be.

OracleInaCoracle · 27/03/2008 16:03

hi, it is possible to get false positives/evap lines with CB. www.peeonastick.com has loads of pics. the other explanation is that you had a chemical pg, very, very common. were you ttc?

Original poster
lizalou · 27/03/2008 16:09

Lissielou we have very similar names.

Yes, I'm trying but it's only the first month so I'm not too upset.I have a 9 month old and I would like to have another very soon if I can. Now I've had my period I'm finding out just how much.
I've never heard of chemical pregnancies but makes sense. Off to google now.

OP posts:
beaniesteve · 27/03/2008 16:10

I read that the Digital ClearBlue ones were not as sensitive as the non digital ones.

Original poster
lizalou · 27/03/2008 16:10

Don't worry NoNickmane-you didn't sound cold,makes sense.

OP posts:
OracleInaCoracle · 27/03/2008 16:13

i hate the digital ones, they are much less sensitive. i always use CB now. i know they cost more, but they are more accurate. you just have to know the difference between an evap line and a bfp (sounds simple, but ive been caught out 100's of times)

Original poster
lizalou · 27/03/2008 16:52

The first was definitely a positive line. Lesson learnt-test once my period is well and truley late. Thanks all.

OP posts:
OracleInaCoracle · 27/03/2008 16:59

lol liza-lou, im a bugger for early testing!

WorzselMummage · 27/03/2008 17:00

I had a bad experience with a CB test, Wee'd on it at something silly like 10 dpo it was negative, i think, i only looked at it for a minute of so then put it on the window sil.. went out for an hour or so and look at it again it was the brightest most convincing looking positive i have ever seen, a definate blue cross, nothing like an evaporation line or anything like it it was as if it was positive. I knew it probably wasnt right though, i'd only wee'd on it for something to do so did another which was definate negative and indeed i wasnt pregnant.

I wouldnt trust clearblue again tbh.

HairyToe · 27/03/2008 20:18

I keep reading on MN that Clearblue Digital is less sensitive but that hasn't been my experience at all. I had a chemical pregnancy last month that was only picked up by the CB digital tests which I did - normal CB and Ebay cheapie both came back negative.

I had positive CB digital 2 days before period due day, then again on period due day (other tests still negative) period arrived next day

OracleInaCoracle · 27/03/2008 20:30

see, hairytoe, my experience was totally different. my ep was not picked up by CBD the day before period was due. next day i got a bfp on CB regular

Deux · 27/03/2008 20:47

HairyToe, I found CB digital ultra sensitive too - I got a 'pregnant' on one and my hcg was only 5.4 - I had hcg bloods drawn that day! 2 days before my hcg was 20.3 and got a 'pregnant' then. Was a chemical pregnancy.

HairyToe · 27/03/2008 20:50

??? now i'm even more confused than i was a week ago when it happened

Trouble is from now on i'm unlikely to completely believe any pregnancy test whatever result it gives! Realistically I suppose if I ever do get a BFP again I'll end up spending ridiculaous amounts of money on various brands of pregnancy tests just to 'confirm' the result. aaaaaagggghhhhhhh.

roquefortlover · 27/03/2008 22:14

Hairytoe, I too had a cp last month and my experience was like yours - several positives with CB digi starting day before period was due, and up to 4 days after, but nothing on other tests (actually a faint +ive on First response now I come to think). Now I don't want to test at all unitl I'm a week late and I have got a complete hatred of CB digi for keeping on giving me false hope and confusing me! Boots cheapies for me now I think.

Original poster
lizalou · 28/03/2008 10:08

Oh I'm pleased I'm not alone in this. Was thinking I was imagining lines.Have to say I used CB with my last pregnancy and it was accurate but not until day my period was due. I swear I'm going to wait until my period is a week late from now on-this week has been horrendous.

Still having nausea-did you ladies have this with your CPs?Starting to blame the pregnacare tablets....switching to plain folic acid today.

OP posts:
lennied · 28/03/2008 14:38

Lizalou, pregnacare make me naseous too, might be worth switching. I taken sanatogen pronatal now - cheaper too. I had a CP the cycle before conceiving DD a couple of years ago. PG symptoms continued for a few days but tailed off with period. HTH

HairyToe · 29/03/2008 18:21

Sorry I've been away so am a bit late in responding but Deux and Roquefortlover I'm so glad to hear your experiences were similar to mine. I waas really beginnning to think I had gone mad and imagined that pregnant word (twice!). Sounds weird but psychologically it seemed harder seeing the actual word Pregnant and then it not being real (weird I know) than if it had been a line or a cross.

HairyToe · 29/03/2008 18:23

PS lizalou I had no symptoms to speak of at all - was gobsmacked when i got a positive. My boobs were a bit sore but then they have been on and off since and I'm beginning to think thewy always are...maybe I need a bigger bra

roquefortlover · 29/03/2008 19:39

Hi Hairytoe, I know just what you mean about reading the word...I got 4 "Pregnants" and if I had only doen other tests prob. wld not even have thought I was pg, which wld have saved me a lot of upset!

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