confused

Celia

I had an early ultrasound at 5 weeks on Wednesday may 2 i thought I was 5 weeks n 3 days but on the ultrasound I was measuring 5 weeks n 2 days my lmp was March 24 th 2018 my cycle last about 6 or 7 days i had a 29 day cycle that month but i am wondering when I concieved or if I ovulated later