Stomach after pregnancy

Elise
Has anyone had problems with their stomach after pregnancy?
I had my son by C Section and ever since I can feel movement and fluttering inside like he's still in there! I also get bad lower back pain every morning.
The doctor sent me for a scan 4 weeks ago but they have lost my results and getting answers from them is taking forever.
I'm also 4w4d pregnant so am worried my muscles might be damaged