Sarah: Yay for that lovely dinner with in-laws, for the sweet SIL and for the husband who cooks for you

I am sorry DH seems detached from your TTC efforts but at least he understands when you try to make him understand

I think most guys don't know much about female reproductive physiology and neither do they want to know...they probably don't like to see beyond the sexual attractiveness of woman or else it would ruin all the fun for them

Who knows...too much technical info may spoil your fun in BD with DH so you might be better off without him knowing all the details
Here is an abstract (parts of it) of a published article about research done on humans regarding ovulation and LH (Lutienizing hormone which is ovulation hormone):
Blood samples were taken at 08:00 a.m., 12:00 a.m., 04:00 p.m., 08:00 p.m., 12:00 p.m., and 04:00 a.m. from 19 subjects for 4 consecutive days, once 17beta-estradiol (E(2)) values reached 125 pg/ml (days 7-10 of the menstrual cycle). Initiation of the LH surge (50% over the mean of previous values) occurred at 04:00 a.m. (20% of the cases) or at 08:00 a.m. (80% of the cases).
Based on such data and my DH's knowledge of how such hormones follow human circadian rhythm, I was suggesting you to do OPK test around 11 am (with 3 hour concentrated pee). Although LH surge lasts 2-3 days, levels fluctuate within a day as well and are supposed to be less in the night so if you are measuring at night only, you might miss the smiley.
Surge for ovulation hormone is supposed to happen in early morning hours, FMU is night's urine, once it is emptied, 2nd urine gets concentrated with ovulation hormone released in body in the morning.
If you see first smiley at night, you'll definitely see a smiley in the morning
sorry thats gone way over my head
so if I pee at 9pm and get a smiley face, Im likely to pee again before bed, then pee in the morning at do the test, how comes theres definitely going to be another smiley face? I dont get that bit.
Sarah, lets say for example that you tested on
CD13 PM- no smiley
CD 14 PM- smiley (according to my understanding if you see a smiley at night on CD 14, surge happened at CD 14 AM)
CD 15 AM- smiley (expected!! because before ovulation LH remains in blood stream for at least 2 days, so after first surge on CD 14 AM, another surge is expected on CD 15 AM)
Sorry if I am confusing you again, DH and I have medical background so we tend to go in detail of such issues. I really don't mean to confuse you

, just wanted to share the info I thought might be helpful to you.
