LH Surge? Questions??

Angela • Baby girl born Sept 17 💕Preemie boy and girl DCDA twins born Dec 18 🇬🇧
I've read that the surge happens in the morning. It's been 12 days since I got a high reading on my clear blue and it's still flashing 12 days on. AF is due on April 7th. Is it possible my surge wasn't detected as it happened at a different time of the day??? Can you still ovulate with a high reading? 
Why is making a baby so technical. I wish it would just happen. 😞
Any one similar experience??
Thank you xx and baby dust to all!!