I had sex on Wednesday, no condom and it was sort of tough. Then two days after I noticed I'd get a heavy white discharge. I would just feeling it coming down for like a couple seconds but that's it for the day it's not continuous. It's like twice the amount of regular discharge I usually have and it's odorless. Then in the night I got this really back pain... is this sumting I should be worried about? Was it related to the sex? Any advice thanks!!

I think you should check with a doctor. With the back pain, it could be a urinary tract infection or a yeast infection or not. But it is always best to go and get it checked out anyway. Good luck!