Sorry to hear of your loss. I actually ended up needing a d&c as I kept having bleeding on and off after my miscarriage. There was still a bit of tissue leftover so they removed that.
It's been a month since my surgery. I don't remember any cramping afterwards. Though the feeling you are describing on the sides of your abdomen describes what I feel like when I guess I am ovulating.
If I was in your position I would go back to my obstetrician and express my concerns. I have my fingers crossed it is all normal for you!