Early scan!

Liz
Hi ladies!
After an early loss in March this year (@6wks), and a mmc in june (@11+3), I'm delighted and terrified to say I'm pregnant again! I'm 3wks6days today (going by lmp!) so super duper early! 
My question is this...my ob told me to book for an us in 2weeks (all being well), but I will only be 6wks, or approx 4wks gestation. I'll definitely go, I just wondered if anyone couldshare  any insight into what I might be able to see...if anything?! 
Thanks ladies! x