FYI, incase anyone else experiences this:
On Cd12 I tested with CB Digital OPK at 730am, 12pm, 6pm & they were all Negative (O) I planned to test again at 10pm-midnight but fell asleep. I woke up at 245 am (very early Cd13 now) & it was Positive ( Smiley face ones).
I tested again on Cd13 at 830am, 1pm, 6pm & midnight- All negative (O)
I tested again on Cd14 at 830am, 2pm & 7pm- again all negative (O) DTD on cd14 at 830am due to CP/CM signs
I was concerned that the cd13 2:45am positive was a false positive so I called the ClearBlue helpline today (only open mon-fri) & explained my concerns, this is what they told me:
CB Digital OPK's will NEVER show a false positive. The little digital monitor that you insert the stick into records previous info from other tests that you have taken & is looking for an INCREASE in LH since your last test. They said that had I of tested late at night on Cd12 like I had planned to, they would of expected me to see the smiley face based on the info I supplied them. When I tested in the morning after the smiley face & it showed Negative, this is because it is unlikely that the LH had surged more so the monitor didn't pick up an INCREASE.....it doesn't mean that there was not any LH in my urine.
Also, they said that Digital OPKS's work very differently to regular line OPK's and not to compare them. With regular OPK's you shouldn't test with FMU, but with digitals it is advised that you do because they are looking for an extra hormone & to IGNORE any lines that are on the digital stick as the naked eye can not read them & not to test again once you get a as it is pointless re the monitor looking for even more of a surge than the one it picked up. This is also why you can't resuse the digital monitor with a new pack....you need to throw it out & start again with the new packs monitor.....(Once you have your smiley, stop testing & you CAN save any sticks that you haven't used & use them during your next cycle with the same monitor)
Hope this helps, wish they would put this info on the leaflet!
**EDIT: Forgot to add that I held my urine for at least 4hrs between tests & that they said you can get a false positives if you are taking some fertility meds-ones that contain LH & Oestrogen, I think she said, I'm not 100% sure as I'm not on any fertility meds. Also, you can't pee in a pot then test & get a & retest it to double-check as the second test using the same urine could come up negative because the monitor would of already recognised that surge & won't notice an increase! xx
**If you get a few smileys in a row, this is because you have caught the VERY BEGINING of your surge (over the 40 miu that is the DOPK's sensitivity) Most women are likely just to get the one smiley per cycle (which is the maximum peak of the surge) This is the difference between the regular line OPK's which you can line up & see the lines get progressivley darker. Not so with Digital OPK's, the regular ones have a lesser sensitivity which makes them harder to interpret as most women have LH in urine throughout the month.
I think, now that I know all this info, Digitals are the best way to predict O (especially if like me you are attempting O+12) as it will really pinpoint your most increased maximum surge, then, in my case, O was only 18 hours away, but had I tested when I had to planned to, it would of been almost exactly 24hrs from the smiley.
This attempt resulted in a BFP at 14/15dpo!!!! I am soooo thrilled, thought I was out this month due to weird OPK's! Thank you Melody & Nini for all your help & guidance on O+12, I can't believe I got a bfp on cycle 4 of O+12!!! only time will tell if I'm having pink or blue!! xxxx
FYI of anyone reading this, my signs were slight & very on & off: Mild Cramping, Sore Boobs, wet lotiony CM all the way through after attempt & low & hard CP, I don't temp so don't know about these, Frequent peeing & very slight cold/flu symptoms, very subtle nausea-only a couple of times. I Had BFN's on cd 24 & cd 26 (10 & 12dpo) & BFP on CD28! (I have a 29/30 day cycle)