how many dpo were you?

If you were 100% sure on the days you ovulated, how many days after did you get a positive? I'm asking because I've been pregnant 3 times. The first time I tested the day of my period. But the last 2 pregnancys, we only had sex once each time and it was the day I got a positive test. Exactly 6 days after that I got a positive each time. I lost both pregnancies.