Hi all!
First of all, I should introduce myself. I have been lurking for ages, but haven't posted. I miscarried in February at 9 weeks. That time we got pregnant on the first well-timed try. Now we are just getting back in the swing. This is the first month I am doing anything more than using Period Tracker on my Android. Before the miscarriage my cycles were 27 days without fail, but it looks like I'm now about 30-31. So I have been thrown off a bit.Â
I ordered some Preseed (love it!) which came with an Ovatel microscope and several free OPKs. I started playing around with saliva ferning when I got it in the mail around CD10. On CD10 and 11 it looked to me like I could have been transitional. Hard to tell since it was my first time looking at it. Then from CD12 to now (17) I have seen basically nothing resembling ferning. IÂ should be ovulating today or tomorrow, so I was confused. Went ahead and took my first OPK for giggles, and it looks positive to me! Opinions???
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Here are my pictures from today's saliva and my OPK:Â http://tinyurl.com/4x4nx7o
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Welcome to MDC or at least welcome to posting! And I'm sorry for your loss.
  And yes, a day can make a huge difference! It's also not uncommon for your body to gear up to O and not succeed and gear up again later in your cycle with delayed O. So you could get increasing ferning and darkening OPK's and not actually O. Only temping allows you to see if ovulation actually occurred. If you run out and get a basal body thermometer today you should be able to catch your temp shift this cycle! If you have questions about temping, just post! 
  Many things can delay O like illness, injury, travel, stress, strenuous exercise, etc. A lot of women don't realize that when you O is not constant. What is fairly constant (within 2 days usually) is the period between O and AF called the luteal phase. Again, you won't know how long your LP is until you temp. The average is 12-14 days, but many women have shorter or longer ones (mine is 10 days on average).  I just think when you're first starting out that charting would be the most helpful. You can add in the OPK's and saliva tests as secondary fertility signs to give you an even better picture. In fact I would think that it would really help you to see when you ovulate in conjunction with what you're observing in your saliva to better learn how to interpret the saliva. If you notice really consistent patterns over several cycles then you could better rely on the saliva alone (without temping) if you prefer it. 

