Though rare when IUD inserted after abortion
when the uterus
will be comparatively soft, there is possibility for escape of IUD into abdominal cavity through rent in the uterine wall,
so you better consult gynecologist, check for presence of IUD, if needed undergo ultrasound
or X-ray abdomen to rule out this possibility,
one more possibility is infection of internal organs due to D&C that can also be ruled out with examination.