Is it by the day you ovulated?

By the first day of your last period?

Or by the last day of last period?

My first pregnancy I told them I knew when I ovulated & I should be less farther along & they tried telling me I had an ectopic pregnancy so I went to the ER to get transvaginal, ob had predicted I was 9 weeks along & I told him I was 7 & I was right & there was a heartbeat & good placement, he’s now 14 months old. I had counted from the day I ovulated.