Dating scan...

Amanda

So i am a little confused i know when i ovulated and how long my cycle was going to be (28 days) and i tested at 9 dpo and it was negative and then tested at 12 dpo and got a faint positive. I had my scan on friday and was told that i was 6w4d but by my period date i should be 7w2 and i find it hard to believe that i would get a faint line that close to ovulating if i was only going to be 6w4d.... feeling skeptical about my due date 🤷🏻‍♀️🤷🏻‍♀️