Brown discharge

Tia

I’ve been having this brown discharge for the past couple days and I’m not sure why. I’ve never experienced this before which is making me more concerned. My last period was kind of irregular (it went for three days skipped a day and then came back the last day), which also never happened to me before. This two new things have me scared and concerned.. I have a gyno appoint in a couple days but I need some peace of mind NOW lol. Thoughts?