Help plz

I stopped getting my depo shot, I was supposed to get a shot Feb 28th. Depo stopped my period completely so I haven’t had a period in about 2 years.

I got my first period on the 15th-19th and it stopped completely, which is normal. But I’ve recently had some bleeding. It started yesterday. It’s dark red and brown, and light.

Should I see a doctor?? Or does this seem normal

(I’m 19 and not sexually active)