BBT rise/fall

Courtney • First child beautiful son born 5/6/2015. Second son born 9/8/2016. Third son born 3/9/2018. Baby #4 heaven baby Sept 2018. Rainbow Twins due thanksgiving 2019!
Ok so never had this before. 
​Started clomid this cycle. I got my positive opk 2 almost 3 days ago got my temp spike yesterday morning. My temps before ovulation range between 97.3-97.5ish and I spiked to 98.10 yesterday. This morning I dropped back down to 97.81. Idk if it's because my OB said I had 4 eggs that were going to drop or what but I'm confussed as to why my temp dropped back down. Any advice would be helpful.