Confused white discharge before period

Vanessa • 33. UC remission, fibromyalgia and arthritis warrior. Happily Married. Mother to a 10yr old daughter. miscarried baby #2 after 13 mnts of trying..finally pregnant with my rainbow after 5 years of trying.
Hi I'm new to the app. Me and hubby have been trying to convince for maybe a little over 2 months. My period is due either tomorrow or Thursday. (Old app says tomorrow. Glow says Thursday.) I've been having some cramping on and off since yesterday. And white discharge today. Has anyone experienced this? What could it be??