PID???

So I had unprotected sex in July and it was a mistake. I know i should never do that so don't preach that please. I was tested three weeks after that for stds because obviously that's a good idea, and I was negative for everything. But I've been having weird discharge for a long time (I think it's weird, it's white), and it's making me really paranoid. I don't have insurance or id just go get an exam. Does anyone have any advice or similar situation? I'm tired of freaking myself out by googling stuff haha