Yes, you can wear it, just treat it with due respect. Before wearing the chain or hold the amulets always wash your hand when you are wearing or taking it off.
You need to clean your hands after you engaged with your sanitary napkins, or if you feel it is uncomfortable wearing the amulet with you during the period, you may keep them in your handbag or purse, it will still give you the same protection. If you have
full faith and trust on your amulets, you will be blessed.