I appreciate your query.
You have not mentioned the pattern of your previous menstrual cycles.
Before you underwent IUI.
that is given for luteal phase support following IUI.
After stopping sometimes, it might take upto a week for you to have your period, though normally you have it within a day or two.
If you do not get your period within one or two more days, please consult your doctor for a repeat pregnancy
test / ultrasound
All the best.