Bloating AFTER period

Cinnamon

I had my last day of my period two days ago, then started bloating and cramping bad today, I never do during my period. While at work I was spotting light pink and it lasted maybe 3 hrs, anyone had this happen or know anything it could be?! I feel like a baby is in my ribs and making it hard to get a full breath! Pregnancy test came back negative (had a period 4 months with my last before I found out I was pregnant, so wanted to be sure)