basal body temp newbie

Hi everyone! This is my first post! 😊 I just started a new cycle and I’d like to start tracking my bbt. I know the temp has to be taken first thing in the morning before getting out of bed at the same time every day. What I’m unsure about though is what could throw off an accurate temperature? For instance, my husband leaves for work at 5:30am and I don’t need to wake up until 7. If I wake up for a moment as he’s getting out of bed but fall right back asleep will that throw off my temperature? Or if I wake up to readjust my pillow or roll over? Just wondering how sensitive the timing is!! Thanks in advance everyone! ❤️