Is it possible I missed my LH surge?

Have you tracked before? I am new to it as well, about to start tracking in my second cycle. I usually start with the first few days after my period once a day at 12 ish, then around day 10 of my cycle I test twice a day, one midday and one later in the day between 5-6. I keep going until after my peak is done, then test once again for a few days so I can see it tale off back down. It is a possibility that you had a surge but missed it, some have very sudden surges. But can have a high bbt for other reasons, are you feeling sick/under the weather?

Could be your going to ovulate later than you think, that was the case for me. I would test my LH and it never seemed to leak when I thought it should. I used to test morning and night. But I found tracking my temp and using natural cycles the easiest way to see when I was fertile or not. First month I used it and I fell pregnant as it caught a surge in my temp late on in my cycle and that was when I actually ovulated.