late period!

Hello al! So I am about 3 weeks late for my period. My baby is 6 months old and I am still pumping about 4 times a day. I had a full blown period last month ( my first one since birth) and this month I barley spotted light pink blood. I have been superbloated and crampy really bad! What do you ladies think? Should I be concerned about pregnancy or just normal do to pumping?