I have an IUD and I started my period today or at least I hope I did I had a lot of dark brown discharge. I am freaking out. This has never happened before.

Brown discharge is normal and only a sign of old blood being cleaned out. Really nothing to be concerned about.

Please read this sticky (https://www.askmehelpdesk.com/womens-health/info-answers-frequently-asked-questions-our-health-expert-53865.html#post250355).