I got an ultrasound at 9 + 1 (based on my period but i couldn’t remember the exact day, it was between 4/3-4/5, so they put it as 4/4) and was consistently measuring at 9 + 4. Based on my period I would be due Jan 10 but based on ultrasound Jan 7. I know they won’t change due date if it’s plus or minus 6 days. My question is do I consider myself 10 weeks 1 day or 10 weeks 4 days? The ultrasound was a week ago.