Thanks for the query.
You didn't mention at what gestational age
you underwent D&C.
will remain as pelvic organ till around 12 weeks then only it can be felt abdominally.
After D&C it will take sometime for the retraction of the uterus.
So your protrusion of abdomen can be because of previous pregnancy
Anyhow you once go for ultrasound
which will rule out the possibility of pregnancy and can also detect any retained products of previous pregnancy.