Ok. Just want to make sure we don't miss our window since we're doing IUI again.
Your RE didn't recommend the digital OPK for tracking for your IUI?
Mine wanted me to use the digital that shows a smiley face because it was easier to get a reading than trying to match lines, if you can grab some I highly recommend it.
It used the ones you have now for about 18 months but did find the digital much easier to know when to go in for IUI monitoring.
Good luck!
I have been using the digital for a year, but they said these were better so you can see it getting darker as you get closer to O.