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I always had a "fade-in" and "fade-out" effect with mine, starting a few days before I ovulated. They started out pretty faint, and progressively got darker the closer to ovulating, culminating with a line that was as dark or darker than the control, then getting lighter again.
ETA: I know not everyone's does this, so it's not a hard and fast rule, but it was always a good indicator for me that my body was gearing up to ovulate.
@SFreeman2187: I'm sorry I have no idea but I hope someone answers because I have the same question. I am on CD17 and still not a positive OPK usually my cycles are really regular 29 days. This is our first month TTC but I have been off BC for 1.5 years.
In my experience, I'd usually get a light line 12-24 hours before my dark, positive line on an opk. I think you're likely to O in the next few days!
Alright... then it's ON tonight! And tomorrow. And the next day... and the next...
DH is enjoying TTC way more than me.
I always got a line. It didn't matter if I was close to ovulating or not.
@SFreeman2187: Did you think I just meant the control line? lol. That would have been a lot for me not to realize that first line should always show up for all those months of ttc lol. I always showed both. The second line would get darker when I o'd but it was always there.
@mwitter80: That's what happens to me too. I always have a slight line but then I have a fade in where it gets darker leading up to O. There's always a second line though.
I always have a slight line as well, and it fades in as O approaches. After a few months of trying to figure out when it was positive, I started comparing with the smileys, and it has been worth every penny!
I don't always have a second line, so when one that's even remotely dark shows up, it tells me I'm gearing up to O. I definitely have a fade-in pattern.
I got a fade in-out pattern too and the strip tests never seemed truly positive for me. I started using the smiley tests to confirm when I thought I had a positive on the strip test. Even when I had a smiley the test line still wasn't as dark as the control line (but I clearly was ovulating b/c I'm now pregnant).
Wow, some of you guys always had a second line faintly visible? I've never even seen a FAINT second line! Jealous! ;)
Tis is interesting. I just started OPKs this month, started about 10 days ago, and I have always had a second line. Yesterday was the first time I think it was pos, but I've always gotten the second line. I'm on cd 31 today and I started using them about cd 20 or so, but I'm no ovulating, so I'm not really expecting a positive. Today's was definitely lighter than yesterday's though!
Usually mine fade in and fade out, as well. I always think that I have a positive OPK well before I actually do, but I start keeping them to compare, and they definitely get much darker.
I don't get a second line until one or two days before I ovulate.
Im going to answer your question with YES: I never get a 2nd line until about 4 day before O, I'll start to get a light 2nd line & then it gets darker and darker as it goes. On the day it looks super dark, I'll use a smiley digital test to confirm.
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So I know you're not ovulating unless the second line is as dark as or darker than the control line.
This is my first month using them and I've never had a second line show until today.
Do you guys think that a light second line is "almost ovulating" but not quite?