Opk or bbt??

CP’s mom

So... on cd 10 my temp dropped. Spiked up on cd 11 and has stayed up there (on cd 16 of 25). I had EWCM cd 9-12. It was really thick the first few days.

First month using opk- didn’t get a positive Til the night of cd 12 and another twice cd 13- which would mean I ovulated on cd 14?

Funny I had my son at 35 and it was SO EASY! Ugh!

What you guys think?? Bbt is right?