Yes I am the one that posted about high blood sugars and the reason ended up being pregnancy. Here is that thread: Blood sugar won't come down! 17.4 mmol/L (313.2 mg/dl) all day, despite corrections - #18 by VikaPlume
I have never had high blood sugar due to ovulation, although the first day of my period I to to run a bit high. But I’m also a type 1 and I don’t have PCOS so that will likely make things different. YDMV
The high blood sugar was my only symptom. And it was quite high. And correction after correction, it made no difference until I started producing ketones. I ended up in hospital where I found out that pregnancy was indeed the cause. The hospital brought it down and I was discharged, only to come back a bit over a week later when my meter complained that my sugars were over 33.3 mmol/L. And high blood sugar has been on ongoing concern - this is the second time now that I have been admitted since then.
Definitely take a pregnancy test. It is too early for a urine test, so insist that you have blood drawn ASAP, especially if a correction won’t bring your numbers down. And if you are really high and your numbers won’t come down, just go to the ER and explain the situation. It is better to go in for high numbers and have them run a pregnancy test STAT and rule pregnancy out so that you can check for other causes for the highs than it is to ended up in DKA. And if you are pregnant, congrats! Welcome to the club!