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.
Read the full article on: What to do after artificial insemination? Two week wait and advice ( 37).

Zaira Salvador
B.Sc., M.Sc.
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV