Which BBT to use

I know your suppose to get 3 hours rest and test same time but when you take a dog out to potty every night and your husband has a crazy work schedule sometimes you just shot for your bbt that you slept the most.

Last night the dog got me up at 1 (usually it’s 330 and I take it). So I took it because I knew I wouldn’t have a full 3 hours rest when I wake up with my husband at 330. It was 97.87. Well I fell back to sleep and didn’t wake back up til 7 so I decided to take since I had a full 3 hours. It’s now 98.31. Which one should I use?