Suddenly I'm overly paranoid about getting caught using drugs.

I've smoked weed almost every day for 9 months now, and been to some festivals and raves on other drugs without any issues. I've always been paranoid of getting caught, but over the last few days I've been freaking out, and my mind has been racing about it. This was instigated by reading a post here about someone getting caught for possession of 1.4g of k, and that made me think about how much I'm carrying a lot of the time. I've got a lot on at the moment and I'm busier than ever, so perhaps that's a lot of it. But yeah, I would love some words of encouragement if anyone has any :p I've just got to plan another trip and have something to look forward to, and think about sorting my life out a bit. I've also been reading the my student union anonymously confessions insta page and there's been some things come up about people getting caught and drug tested which has freaked me out. Anyone else in this boat?