I usually fill about 7 bobbins before I start to embroider. Don't know why I picked that number but I want to have the extra bobbin ready. I do not have your specific machine. If you have a manual, I would look in it to determine how the machine gets to where you left off. Some machines will are easier than others to reposition. You want it to start again a 6-7 stitches before you ran out of bobbin as far as I recall. Just took a glance, If you don't have a manual, you can download one.