Bbt help!

This is the once cycle where I didn't use opts and I am really kicking myself for it now 😑 so cd 17 Ff says I O. Temp in morning was 97.1, that night Hubs and I went out for a few drinks. My sleep schedule was messed up that day too (feel asleep around 3, woke up at 6...) I do take my temp same time every day. What do you think can temp slow rise