Will the ER report substances to insurance?

I’ve been running a fever for over a week and a half now. Last Tuesday I found out I had the flu (today being Friday). I was mostly on the come up Tues/Wed of this week, but Thursday evening/overnight felt awful and spiked a fever of 103. I also got an IUD a month ago and I’m worried it might not just be the flu, but that my IUD is infected. Or, that I’m having an EBV flare up again. But I’m anxious to go to the ER because I don’t know if they’ll run a tox screen. I’m 20, on my parents’ insurance, and smoke weed and nicotine. I’ve actually cut down a lot in the last month or so (used to wake and bake, now only use it to sleep). But it would still def show up on a screen. Would they do a tox screen, and would they report the results to insurance?