October 25, 2017 at 1:50 pmMaybe dumb question - why is it not recommended to test for LH surge with first morning urine? I've only been using OPKs for two months now but both months I got a positive test after testing first thing in the morning. Does that mean they weren't really positive? This month I did try to do a second test in the afternoon but only a morning one was ever positive. TIA!
October 26, 2017 at 10:13 amYou can receive false positives if you use first morning urine. If you are having a hard time catching that lh surge, you might want to try testing twice a day - mid-morning and late afternoon!
October 30, 2017 at 8:19 amSome women have their lh surges slightly different from the norm. I have had a couple months where I caught part of my surge using fmu. I test at least 3 times a day when I know I'm close to o, and on the days I see the opk getting darker, I check 4 times a day. As you use them more, you'll be more aware of when your lh surge occurs. And you know, you don't have to be super exact either. As long as you get the general day down, you should be fine.
Some women even see positive opks for several days before they actually o. There's a general standard to not use fmu, but we're all unique! Do what works best for you!
The Clearblue dual hormone tests do recommend FMU and that is because they are testing for the oestrogen too (that's whwhat pushes your temperature down before O) which is produced and builds up in urine overnight.
November 1, 2017 at 4:07 amInteresting. Thanks for your responses! The tests I was using said it could be done any time of day so I wasn’t sure if that meant I didn’t have to follow the no FMU rule. On weekends I test several times a day but it’s hard for me to test anything other than FMU on weekdays.
November 1, 2017 at 4:50 amI have tested a couple times at work when I couldn't make it home on my lunch hour. I just shoved my stuff down in my bra and headed to the bathroom. It actually worked fairly well. But then I have a small office and so no one was really around. Good luck to whatever you do!