Estimated due date: LMP or ultrasound?

Sa

Hi ladies! I’m going crazy waiting for my first ultrasound in 2 weeks, and I’m wondering if your last period date was accurate for how far along you were on ultrasound?

Based on my LMP (April 2nd), I’m 9 weeks tomorrow. But I know approximately ovulation day/conceiving span of days, and based on that I would only be about 7 weeks.

Just curious what I might expect ☺️