Just found this thread. Im 17 weeks pregnant but just thought I'd share my little nuggets of info if it helps:
Im 39, first pregnancy, had an ectopic in February so actually 2nd pregnancy. Became obsessed with opks, i tried the ones on Amazon and thought they were crap so only used clear blue. Clear blue would say im ovulating, the Amazon ones would say i wasn't so they're crap. Clear blue are extortionately priced i do agree.
Learned from the opks that i would ovulate one month day 8, the next month day 15, the next month day 11.... so don't just start using them day 12 onwards, or at least if you keep getting the not ovulating symbol (like i was) go back a few days and start testing then.
The month i did conceive i hadn't used an opk!!my cm told me i was ovulating then took a test to confirm. Sometimes just listening to your body helps.
Lastly, i know how consumed you get by ttc. All day everyday every month it's all you're thinking about. And all you see is pregnant women everywhere and announcements every other day. I really really wish you well and hope you all get your babies.
Apologies for long post.