Hi there - I'm in my 3rd month with Ovacue, 2nd month TTC, and I've learned that you have to ignore the Ovacue messages and colors and entirely rely on your readings. It's harder with IUI than BD'ing, obviously, and I may have missed my window last month so added temping in the mix to confirm O. According to your peak oral readings, you would expect to O around day 15. Are you taking your vaginal readings in the evenings? When you take another reading within the same day, it overrrides the other one, so it may mess up your O confirmation on your monitor, and you can't compare morning readings with evening ones. When you take your vag reading tonight, if it's lower, then you still likely haven't O'd. Michaela also says some people O on the low reading and others when they get their higher one the next night.
Sorry if this makes you feel more confused. It seems obvious, watch for the oral high, then look at Michaela's chart to determine O day, but watch for the vag low and EWCM to determine when, but our bodies are unique, so we're not "one size fits all". That said, if the low you got on day 13 is your lowest, and it sure looks like it, then I'd say Day 14. Watch for your EWCM and go for it. We're using ICI now, so I'm doing three attempts this month to ensure I catch the actual most fertile time.
Best wishes on getting your BFP this month! If for any reason it doesn't happen, then I recommend adding temping. (I know, ANOTHER thing!) I didn't want to, but I'm glad I did this month. I got my Ovacue oral high on day 5, leading me to believe I'd O on Day 13, but then got my first vag low last night, AND a very low temp this morning, which could imply I'm getting ready to O today or tomorrow which is only day 10-11! So I'll be watching for my EWCM and taking OPK's several times a day starting today and if either of those show positive, we're going to start TTC today! Otherwise, I'll keep watching my readings and temping tomorrow and so on. At least when I get my temp rise, I'll know I O'd, and hopefully the monitor will match!
Just know that the colors and some messages may change, but the message for O prediction doesn't, so go by your readings. Michaela's the pro here, so she may have better advice to add.
Hang in there, as you'll discover you keep learning until it happens, and prayerfully it wil be very soon!