Lh surge

Cynthia • 20, engaged and ttc.
Okay ladies. I've been testing for a week now and today is my peak day. Every single test I've taken has came up negative. But all of them before this morning were obviously negative. There was almost no second line to even see ! But today I took one and there was a very obvious second line. Not as dark as it should be to be positive but it was definitely there. So my question is should I test several more times throughout the day to see if it's positive or could I have ovulated while I slept ? I checked my bbt too for the first time today. It was only 97.2 . Is that normal ? Never done it before