Good evening everyone, I'm back with a question How did your period st…

Good evening everyone, I'm back with a question How did your period start for you? I can't figure it out My son is 7.5 months old and in October I had one day that was a little good and passed Today I got sick and went to the bathroom and saw blood and my waist hurts terribly ? Did my period start? I just don't understand because in October I also thought they were coming again))