I think it's hard to say with different brands of opk's.
I do get a 1-2 day fade in with LC OPK's but not with fortel brand opk's. I haven't used confirm before.
Sorry Sally J,
I forgot to say. I do get a faint line through out my entire cycle with lullabyconception opk's. However with fortel, not even a trace of a second line until O day.
So it can vary brand to brand.
Sassba
SallyJ - with Confirm, in my experience, a faint line shows that O is on it's way. When I used Confirm, I got about 4 days of gradually getting darker 2nd line before a positive was registered. So I reckon you could start BDing from tomorrow night, if today was your first faint line. So O may actually still be 3 or 4 days away (don't quote me on it as it might be different for you).
With Fortel OPKs, i've noticed a difference - i seem to get a sudden positive (with no faint line lead-up), or only one day of a faint line.
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