BBT question

Avona • Mother of one, trying for #2
Hi all, have been ttc for over a year but only started tracking BBT this month. How much does it matter if you take bbt at a different times, + or - 1 hour? Also this morning I left the thermometer in a different room so I had to go get it. As I'm not in bed as I had other mornings, does this make a difference? BBT was up .5 tomorrow which I guess is a sign I have ovulated but wasn't expecting this for another few days. Thanks