Hello,
Thank you for your query at DoctorSpring.com
I understand your concern.
I have reviewed the entire history, and the fact that there was no bleeding after the exposure and also that till now the bowel movement is normal, rules out any chances of perforation or peritonitis. In fact, in peritonitis there will be immediate high-grade fever warranting an admission to ER.
Regarding rectal perforation, if it had to happen, it would have happened right away, and would have caused severe bleeding.
So, please do not worry. The pain is because you tried it for the first time, and also the object was a little sharp, so there will be tiny rectal injuries inside which will heal on it's own.
Regards,
Dr. J