Here I am again – having ovulated recently but not being too sure of the day itself. With the positive ovulation predictor kit test (opk) last weekend I know I ovulated in the last week, but its unclear which day.
This is the second cycle where I have had a range of possible O dates instead of confidence in one particular interpretation. While its not critical to know exactly which day, I enjoy trying to solve the puzzle and better understand my body’s workings. So, here goes:
When I added my temperature yesterday morning, Fertility Friend finally suggested that ovulation had been confirmed by a third high temperature. But to my surprise it put ovulation on the same day as the positive opk.
Depending on the detector analysis method used, Fertility Friend suggests O anywhere from cycle day (CD) 16 to CD19.
The Fertility Awareness Method (FAM) detector, which follows the rules of the classic Taking Charge of Your Fertility book, puts it on CD 19. That method is purely based on temperature, but I’ve found scientific papers investigating the time between ovulation and temperature rise and it can be more than one day. So using temperature alone is really just an estimate. For the 2 cycles in which I used OPK’s, I had a longer than normal time between positive result and clear thermal shift. So a solely temperature-based detection method doesn’t seem adequate.
My LH surge appears to be short; I got a negative saturday night at 9:30, a positive sunday at 4, and a clearly negative by 8 pm sunday. So my LH surge was somewhere in the 22 or so hours from Saturday night to Sunday night. It usually starts while you are asleep so we could assume the surge started the night before CD 17 and peaked in late morning or so on that day. Ovulation is usually 12-36 hours after the LH surge, which would put it at anywhere from late CD 17 to CD 18.
I thought I felt ovulation on CD 18, but maybe it’s possible that the cyst-like pain could have been corpus luteum alone rather than the dominant follicle before the egg was released.
So the OPK based method suggests CD 18, the day after the positive OPK. That is also the strongest O pain with the feeling like a cyst in my left side, so I tend to lean towards that day.
So I don’t think that the FAM-based suggestion of CD 19 is right because my pains and OPK results suggest CD 18 at latest.
The advanced detector method which incorporates temps, CM, CP, and OPK, puts it on CD 17 (day of opk +), presumably because I had a slight temp rise the morning of CD18 and then not another until CD20.
Finally, the FF research detector puts it on on CD 16 (before opk +!), at the lowest temperature point before a stepwise rise.
All in all I’m leaning towards CD 18 with some possibility of CD 17, and am thinking its not likely to be CD 19 or CD 16.
If any readers are knowledgeable about charting, I’d love to hear your thoughts!
PS click on this ticker to see my current and past charts: