Does an hour change BBT a lot?

Co

I didn't log my temperature yesterday because I took it an hour later than normal. This morning I took it an hour earlier than normal because of Daylight Saving Time. My temperature yesterday was 97.79F but this morning it was way down. I went ahead and logged today because all my temps will have to be an hour earlier than the beginning of my cycle. My period is late but it looks like I haven't even ovulated yet. Is an hour too much of a time difference to log? If not, what in the world is going on with my temperature?