If you did have a sonogram that early, (which I did with my first pregnancy), all you'll see is a little "peanut"! That's what I called my baby @ 6wks, my little peanut! Lol
Had an ultrasound at 5 wks 6 days and it was a tiny little round dot connected to a food sac. They zoomed in and clicked and its little heart was beating at 114. I'm sure you being close to 7 weeks, the little dot will be much more visible. :-)