Wondering when we conceived

Sh

Hi! We found out we were pregnant on Friday 9/6 and our first ultrasound is not until 9/19 and I am wondering how far along we might be. My last period before ovulation was July 6th-10th we BD a day before I ovulated

and then I bled again in August 9th-13th around the time I would usually have my period.

7days later I started spotting well before my ovulation window and it has been off on on since then. I believe I am almost 9 weeks. Can anyone help?