There are a couple of things you can do when you're on your period.
1. Maintain good hygiene because that is essential to your physical health to avoid any kind of bacterial or fungal infections.
2. Ideally choose high quality menstrual products. Nowadays there are several eco-friendly options available, such as cloth pads, menstrual cups, or pads made from biodegradable material. Choose those to reduce your menstrual waste.
3. Use a heating pad, take a hot shower, drink herbal tea, and engage in other forms of self care to soothe pain and discomfort. Avoid medication unless absolutely necessary.