BBT & restless sleep

Fiancée wakes up at 430 every day, I tried to bbt but I couldn’t get the damn plastic sleeve on and I had to get up to get a new one so I decided to just temp at 7 when I got up, problem is I couldn’t fall back to sleep at all I tossed and turned the whole time, and now my bbt seems off! It’s been 96.8 ish for two days (low, I know) but today, after poor restless sleep, bbt at 97.6...also last month opk said I ovulated around day 16 and it’s only day 7 of my cycle so...should I toss out today’s bbt???