Home › Forum Topics › Gynecologic Health › How do you know when to change period underwear Search for: This Post is empty. Creator Post January 26, 2021 at 10:20 am #1687 Reply kjay290 Hey y’all! I just got Thinx and I’m wondering how to know when to change my underwear? I feel like I can’t really tell if it’s about to start leaking or not? <3 Creator Post Reply To: How do you know when to change period underwear Your information: Name (required): Mail (will not be published) (required): Website: Cancel Submit