I don't want to label myself as crazy

but...have you ever stared at something long enough that you start seeing things? My last ultrasound was just over 3 weeks ago and every once in a while (okay maybe more often than every once in a while) I pull up the scanned image to see my little one. But what mystifies me is it looks like there is another spine to the left of my little one in both photos that the ultrasound tech let me keep of my last u/s. The ultrasound lasted about 10 minutes and she looked all around and had me shift to multiple positions and I trust her abilities at her job. I am by no means thinking that it is a 'hidden twin' but any ideas as to what it could be? Placenta perhaps? I'm not crazy I promise! One healthy baby would make me more than happy!
No ultrasound scheduled for my next appointment (6/30). In other news I am becoming more sure that the pokes I am feeling might actually be the baby and not just my body stretching.