Hi there, I understand the concern! We are "still" swaddling at 3 1/2 months (don't know the weeks at this point!) She wiggles her arms so much as she begins to wake, I find her with her arms up and the blanket over her head! But she really needs to be swaddled or she wakes up the minute I put her down.
We swaddled our older son until he was around 1!
The sleep positioner is a good idea if he is rolling over. We also keep Nora in a carseat so she can't roll over, and next to my bed, so I hear her when she begins stirring at night.
I do get anxious over "will she be swaddled forever???" but remember with our first, he did outgrow it and isn't swaddled at 7, so I try to relax about it and tell myself she will outgrow it when she's ready, and do just do what works for all of us to get enough sleep right now!