If it is the pulling of the fabric that concerns you, there are two options that would help with that.
You could add a small piece of adhesive embroidery stabilizer behind the berries. These products do a great job and do not leave a sticky mess behind. I don't worry about little pieces left between the stitches and when the project is washed they will disappear.
The route I would probably go is place a piece of plain copy paper under your work (you could pin it in place or even baste it if you wanted) and sew away. I often will do this for raw edge applique. When ready to remove the paper, take a moistened Qtip and run it around the stitches on the paper side and let it sit for a minute - the water wicks into the paper quickly where the needle has made a hole and softens it - making removal quick and easy (if it doesn't come off easily - add a bit more water to you qtip and redo).