Tampons can be uncomfortable for new users. It takes some getting used to, but I'd risk it before taking the chance that you could have a bright red mess leaked onto your soccer shorts by running with a pad on. Physical activity has a tendency to increase blood flow, and thats not exactly what your lookin to share with the whole team.
Try a tampon, read the instructions in the box, and insert properly.. then change it as often as possible and combine with a thin panyliner.
