Looking for some advice please...

I think I missed my peak when using opk for ovulation last month. I had an almost positive then the next day it dipped slightly. Because of this I never put a positive ovulation into glow. Therefore its telling me I will ovulate later than usual this month and af will be later.

I'm normally very regular and get positive opk every month. Although trying for 2 years so awaiting <a href="https://glowing.com/glow-fertility-program">fertility treatment</a> for unexplained infertility, this is our last month ttc naturally and really want to give it all we've got.

Has this happened to anyone before? Should I be ovulating earlier? I've already started tracking every day just in case but wondered if anyone else has had the same issue and what happened?