How pregnant do you say you are?

Alicia
So based on LMP I was 9 weeks today. When I went for my first US on 4/11 the baby was measuring two days behind. (I'm not concerned because that's so close to the time of my LMP and ovulation, ya-da ya-da. So, should I say I'm 9w or should I say I'm 8w5d today, based on the last measurement of baby?