please advice...

I'm in my third trimester and my discharge is literally crazy. Not only that but it makes my vagina ITCH ALL THE TIME. Not on the inside but like sitting on my foot at work and rolling around to try to soothe. It's literally all of my lady parts...I feel like I need a scratcher. Could it be something to do with my newly grown pubic hair bc I can't see my pubes anymore? Or bacteria? Def not an STD...I got tested at the beginning of my pregnancy and haven't slept with anyone else. Either way it's so irritating and embarrassing and ITCHY. Advice, anyone?