This can't be good. Help!

I am having a lot of heavy, wet, milky white discharge. Practically soaking my underwear multiple times a day. 
I am only three days late for my period. But am usually on track with glow. I hardly ever use protection, stupid I know but it has literally never been a problem. Never even had a scare before. But I am discharging heavily for the last week and a half, I already ovulated this month, and never discharge before my period. In fact I'm always dry as a bone the week before my period comes. My boobs are always a little sore before my my period but don't usually swell much at all but they're falling out of my bra. I went to the doctor last week on Monday for throwing up and diarrhea and flu like symptoms and took a preg. Test and it was negative. What is going on and what does it sound like to yall? Help.