blood Clots After Birth

Hello All!
I am 3 days postpartum. Baby was born on the 17th. 
This evening I have released two vaginal blood clots both about 2inchs long and quarter to a half inch thick. 
I called my doctor on the first one and he didn't seem to concerned. Now I am really nervous that it happened a second time. 
Also my blood is back to bright red now that I have passed these. 
Should I call back?