Confused

Kim • 👼🏻MC 12/5/17👼🏻💖09/2018💖💙11/2019💙💖02/2021💖💙01/2022💙

Estimated conception date is 10/26. But when i went for my blood draw at cd 20 (nov 1st) , the results indicated i hadn’t ovulated( number wasn’t high enough) anyone else had this? Took clomid 100mg cd5-9 . I had positive opk on 10/24 (cd12) and 11/1(cd20)