Ovulation CD 18 for sure?

Kayla • Mommy to 4 year old Kimber Elaine and 2 year old Kylie Jean. 3 early miscarriages in the past 5 months and newly pregnant again. Praying for a sticky baby ❤️

First month temping and idk if it estimated because of peak OPK due to the fact it dropped the day after the first temp rise?