Brown spotting not feeling good?

I’m under a lot of stress right now and I haven’t been feeling good the past week or so, my diet has really been thrown off the past two weeks. I’ve been so busy and haven’t been eating as much, like my pants are starting to get loose.

Yesterday I ate TO fast after not eating all day then right after I ate got out the car and ran around Walmart and I almost threw up.

I’m on the IUD and that messes with my diet sometimes.

The last time I had sex was the last week or so of September. And I just got off my period but I’m still having some brown spotting or discharge??

Any ideas on why this is happening?

No sore boobs/nipples, no other pregnancy symptoms that I can think of.

I posted this here and not in the pregnancy place because it could have to do with my health.