Ultrasound

Ok, so I went on 7/19 to my OBGYN to confirm viability. According to this app and my last period, I was supposed to be 7w3d. I delivered our daughter on 3/23, and this is my second set of Irish Twins (born less than 12 months apart). She said because of the cesarean, my uterus has a lot of scarring so it may just be the view, but she said the scanner says 6w3d. It took her a while to even find the baby, but the heart was beating nice and strong. She has me coming back for a 3D on Aug 31st since the actual ultrasound tech is only there on Mondays. Anyway, I’m not nervous, per say, but I guess I’m curious if anyone else has had a obstructed view because of scarring. And I know it’s early but with a transvaginal, on what side would the placenta be?