Well, I used temps religiously for the first few months until I figured out the CM part. After that I mainly went by CM, and if I forgot to take my temp one day (week....month
) it wasn't that big of a deal. You are not crazy for liking to use CM--it's way easier! However, using both CM and temps gives you a better cross check--add checking the position of your cervix and you have three!
I don't know anything about how your thyroid would affect your temps, but from my experience, recording temps is helpful for a few reasons.
* It spikes right around the time of ovulation, and an egg can only survive for 24-48 hours. Therefore if your temp has stayed elevated for 3 days, you can be pretty sure the risk of getting pg has passed. This info is only helpful if you're trying to NOT get pg; if you're trying to GET pg, pay more attention to your CM.
* It drops right before you get AF (or at least mine did). Very helpful in planning when I should start bringing stuff in my purse or to work. (I was always unprepared before I started charting!)
* If it stays elevated for a certain amount of time (I think 18 days? 21?? I forget..) you can be 99% sure that you are pg.
Anyway, that's just my experience and opinion. I taught myself how to use NFP from a book, so I could be completely wrong. In fact, I don't think I've ever met another mama IRL that uses it! So please take everything I say with a big ole grain of salt.