Period??

I'm 5 weeks postpartum and I think my period came back😣 I'm exclusively breastfeeding so of course I'm a little confused as to why it's back so soon. After I had my first, my period didn't come back until 6 or 7 months postpartum. I just stopped bleeding a few days ago😣 I had some very mild cramping yesterday but I didn't think anything of it. Its so far only spotting and it's pink. I already had my 4 week postpartum appointment and everything is fine except I was diagnosed with postpartum depression. I know it's not usually common for it to come back so soon. Do you think my period is back?