Hello all,
I'm in the 2nd cycle of TTC #1.
My cycles are normally between 26-30 days, mostly 28.
On 1st cycle of TTC I used cheapie OPK strips (MomMed), got my peak on day 12, along with EWCM, BBT rose day 13 and stayed up until my period. We BD on CD8, 10, 11, 12, 13. Unfortunately I got my period on 12 DPO (11-day luteal phase).
On 2nd cycle I decided to try the CB Advanced Ovulation Test because it said it can identify 4 or more fertile days, so I figured it will take some of the pressure off. Started testing on CD6 with FMU, as per instructions, and got the empty circle until CD9. Today (CD10) I got a static smiley, i.e.: LH peak.
I panicked thinking I missed my fertile window and only have 1 or 2 days to conceive this cycle! I held my wee for 2.5 hours, didn't drink anything and tested again with a MomMed strip and it was definitely negative. I have no EWCM and my BBT is still in the low range.
Obviously I can't test again with the CB for 48 hours, but I've been left wondering what's going on!
We will BD tonight and tomorrow and keep testing with MomMed but I was looking for other people's experiences with the digital OPK.
At this point I feel like I wasted £30 and I've been left feeling anxious and like something is wrong with me. 
Thank you for reading my rant!