Due date based of last period date or ovulation

Nancy

My last period was on the 4th of November. Ovulated on 24th as that’s when I got cramps. I always get cramps when I ovulate so I know. Positive test faint line last week on the 6th Dec. I ovulated on CD 21. Do I go off the dates of my last menstrual cycle till the dating scan? Thank you

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