My date range may be off... help.

Mattie • Airforce wife ✈ • 🤰🏾🧒🏾 • Due March 2022

I need help.

I am technically 6 weeks and 4 days pregnant but my ultrasound on Friday measures my sac to be 5 weeks and 5 days.

At 6 weeks I'm supposed to be due on June 11. But with the sac being late, when am I due?

Does this mean I conceived a week later? My last cycle date was Sept 4 and my conception date would have been Sept 18 if I really am 6 weeks.