BBT chart w/clomid

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!
Alright. I have never had this is my 1 yr TTC. Did 100mg clomid CD5-9 had 4 eggs to drop. Got my positive LH surge on Cd17 and got my temp spike on CD 18. And normally I stay above 98.0+ after ovulation but this time I have a dip one day and a spike the next. I'm confussed. Idk if it's Bc I am releasing multiple eggs or if this means this will be my month. Really strange for me. Here's my chart. Let me know what you guys think. Thanks!