Dip and rise but no ovulation yet?

Amy • Biz owner, was a teen mom to a now 18 year old 🩷. Baby #2 was a 5 week NICU warrior born @ 34 weeks in August 2020 💙. Baby #3 born at 33+2 in June 2023, currently in NICU 🩷

My temp dip the past few days pointed to ovulation being today or tomorrow but my OPKs have remained at the same level of negative (testing twice a day) all week so I definitely have not had a surge. Then today my temp went back up. Is it normal for it to fluctuate this much right around ovulation? I thought it was usually a pretty clear dip then rise pattern?

First month charting, so I am completely new to all of this