First time mom, possible leaking waters

Hello! I’m 31 weeks, throughout the past two days I’ve been getting wet areas on my underwear about the size of an orange. Usually it happens in the morning, and then a few more times throughout the day. It doesn’t smell like urine at all, and doesn’t have any color to it. I don’t think it’s pee. My question is, how do I differentiate between extra watery discharge (this whole pregnancy mine has been a thicker white consistency) or my waters slowly leaking? Is there a way to test at home? I’m worried about calling my doctor as they’ll probably just tell me I’m fine and overreacting. I have noticed any increase in Braxton Hicks contractions but nothing regular yet.