I just got my BFP 12dpo at 43.7 years old. I was using CBFM and past year (with shortened cycles) have been ovulating on CD 12 or 13. CBFM missed my peak this month, (BFP) and missed Peak at least 4 cycles over past year. Just stayed at High. I temp and used CVS OPK's and when they began to get really dark I knew, and luckily I feel O pains, plus get gassy bloated day of pains so I'm sure I O'd. I called customer svc. and they sent me a disk so they can check it. It was purchased new. I just think that as hormones decline? over 40ttc maybe CBFM not as accurate...
Congrats notrustyyet. You are really giving me for me at 38.
That definitely would make sense that it might be due to a decline in hormones. It's just good to know that a woman can get a bfp even if the CBFM doesn't register a peak. I have gotten a peak every month I've used it and would much rather have the bfp than the peak!
I WOULD get positive OPK's with the cheaper CVS drugstore ones, 20 in a little canister, and for me when LH was just about as dark as control, I O'd w/in 12-24 hrs. My LH surge line was alwys REALLY dark/same as control DAY AFTER I O'd (felt pains), so to be safe start BD when those line are close, not perfectly equal!