discharge?

i had unprotected sex three days ago and yesterday, my discharge today is more whiter,stickier and thicker today than usual. It also smells funnier than usual. What could this be? I’ve had a yeast infection before and it didn’t look like this and the guy I’m having sex with has no std/i’s and neither do I. What like this be? (I’ve also had my period this month(last week))