I have normal 27 day cycles for the most part.

I got a positive OPK on cycle day 11, which Glow then marked that as my Ovulation Day, and changed my expected period date from 11/26 to 11/24, making my cycle only 25 days. Why would it do this? Is it possible to ovulate early and still have a normal length cycle?

Also, I just had a positive OPK. Don’t you ovulate between 12-36 hours later?

I’ve taken a pregnancy test yesterday and today and both were negative. But if my cycle is still actually going to be 27 days, then I’m not even in the range for a FRER. Help please!