Does this look right for 6 weeks?

We thought I was 7 weeks and 4 days based off my last period. But I’m 6 weeks and 4 days.. I’m a little confused cause with my son I was 6 weeks and 3 days and I didn’t know that one day did that much difference.

Top picture - pregnant now (6 weeks and 4 days)

Bottom picture - pregnant with my son last year (6 weeks and 3 days)