Period question after miscarriage

I had a 17 week miscarriage on 2/1/18. My bleeding completely stopped on 2/21/18 and I had a negative hcg test that day also. The last few days of my bleeding were scarce and brownish red in color so I assumed I was almost done. My boobs have been really sore and my appetite has been out of control since Thursday. While at the gym yesterday Friday 2/23/18 I experienced bright red bleeding and thought “oh wow, that didn’t take long for my period to start!” However by yesterday evening the bleeding has completely stopped again. I’m really confused. Is my body still trying to adjust?