Is it a period?

My periods are usually very regular however for the last three months they’ve been off by a couple days. The first time it was because of this horrible life threatening accident I got into. And the second month it was also late probably because of all the steroids and painkillers. Now this third month I was late by a day and then started getting brown spotting. It’s 4 days in and I’m still spotting. Each day is barely enough to fill up a purple tampon. I usually fill up green tampons like every two hours on my regular periods.

Could this be my period? Or should I go see a doctor? Should I be worried about pregnancy?