Periods post D&C ... very very very light

I had a misscarriage in november .. found out at first 8 week apt baby stopped developing so I had a D&C.; Ever since procedure my period has not been normal its very light and almost like spotting. I get all the symptoms of cramping and backache like a week before but barely any blood. I had an ultra sound last month and everything looked normal. Prior to everything happening I was always regular and had a medium flow period. Anyone have similar experience? I still have been ovulating thats how i figured out this weird spotting i have been getting each month is my period because i ovulate a week later. I just am worried about scar tissue from procedure..