Help girls?!

Sophie

I know this is going to sound silly...so I found out I was pregnant couple days ago and had my scan today as just needed confirmation and to see everything is ok baby is fine and is measuring at 8w3d...so this is where it gets complicated because I slept with someone nearly 12 weeks ago so is there any chance it could be measuring small? I slept with a second person around 6 weeks ago so dates don’t seem to work out to be the second person unless it’s measuring bigger...i couldn’t go back to my last period tho because I have PCOS and never really tracked them...if anyone could help me be so thankful x