No, it is not. However, you might experience a mild spotting or bleeding as a side effect of the insemination itself, due to the passage of the cannula through the cervix.
On the other hand, if you have a heavy bleeding several days after IUI, it is likely that it is menstrual flow. In that case, it would mean that the treatment has failed.
Suggested for you: What to Expect After Intrauterine Insemination (IUI).