CBFM missing LH surge?

erinlovesdavid · November 2013

Is it possible/common for the CBFM to miss LH surge? This is my first cycle using the CBFM and I am feeling a little annoyed. I have been getting "high" readings for over a week now. I normally O between 16-18 DPO, so have been expecting to get a "peak" reading any day now since I am 18 DPO today. Well, I woke up to a slight temp shift this morning, which of course points to O yesterday. Feeling annoyed that the CBFM seems to have missed my LH surge because I have never missed it when using OPKs.

https://FertilityFriend.com/home/235254

EmeJay · November 2013

I've never used the CBFM ... Do you use it more than once a day?

erinlovesdavid · November 2013

No, only once, with FMU, specifically.

EmeJay · November 2013

So perhaps it's the reason? Let's say your surge was later in the day?

Anyway, I'd HIO to be sure

erinlovesdavid · November 2013

See, that was my initial thought when reading the instructions, but I figured that it was just super sensitive so would catch even the slightest beginning of a surge. I just don't understand how the monitor can be accurate at all using only FMU, wondering if others have had this issue. We DTD the last few nights, so timing is good, I'm just irritated that this expensive equipment is not really helping any.

TeeJ526 · November 2013

I've been using the CBEFM for 6 months now and it has always caught my surge. Since this is your first month using it, it could still be learning your cycle, so just keep at it. I looked at your chart and saw that you had a negative OPK a couple of days ago. Are you still using OPKs?

erinlovesdavid · November 2013

Not really using OPKs, I just had one laying around and had the urge to pee on something so I did. I don't have any more.

RayRay007 · November 2013

First, I think you mean CD, not DPO.

Second, I wouldn't call that a temp rise just yet.

Third, I only use FMU with CBE digis and advanced digis and can get a positive/peak. The FM compares the readings day over day so should be able to detect a peak. ETA: also, if it's your first cycle it could still be learning.

erinlovesdavid · November 2013

RayRay007 said:
First, I think you mean CD, not DPO.
Second, I wouldn't call that a temp rise just yet.
Third, I only use FMU with CBE digis and advanced digis and can get a positive/peak. The FM compares the readings day over day so should be able to detect a peak. ETA: also, if it's your first cycle it could still be learning.

Haha, yes I meant CD. Why did I say DPO?

My understanding with the monitor is that "high" readings indicate increased estrogen, whereas "peak" indicates increased LH. So how could it be that this has to do with learning my cycle? Either LH is there or not, right? Is my understanding of how the monitor works correct?

And you're right--it might not be a temp rise just yet. Maybe I'm getting ahead of myself.

RayRay007 · November 2013

Eh, I'm not exactly sure how it works, but I guess my point is I wouldn't be too worried about it not detecting a peak. I mean, it sucks for trying to time things, but it doesn't mean you didn't have an LH surge or anything. Just HIO the whole time you have high readings, confirm O with temps, and then it won't matter if it actually shows a peak.

erinlovesdavid · November 2013

True that. It just sucks spending $$ on something and then have it not even work properly. ::shrugs:: Live and learn!

heatherjean81 · November 2013

Is this your first month using it? I have one and when I got it I think I read somewhere that it can take it a month to get used to your body signs. Just a thought.

EDIT: Yeah I reread your original post... it is your first month! I would try it again next month if temp confirms O. I like mine a lot!

erinlovesdavid · November 2013

MeatandBandP said:
You O'd on CD21 last cycle so I wouldnt stop using it yet, and I don't think today's temp increase is that much and it certainly doesn't solidify O. FWIW, I usually get as many as 10 days of H readings and I used to get a peak on it eventually. I don't use it anymore since I'm working with an RE. You can see my chart for many cycles with the monitor.

I kind of consider last cycle an outlier since I generally have 27-28 day cycles. I agree that today's temp increase does not necessarily indicate O, time will tell. I will keep using the monitor for the rest of the cycle, not sure if I will use it next or not. Hopefully I won't need it!

Gizmo36 · November 2013

It definitely took a few cycles for the monitor to "learn" what my surges were. For the first few cycles, I only got one day of High before getting a Peak, and now I get a few days. It is also possible to have a very short surge. I would have an almost-stark white Wondfo in the morning, and a very positive at night. Once I get a High, I use a cheapie OPK at night to double check.

CBFM missing LH surge?

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