If you have been using a hormonal
IUD it is possible that you could have hormonal imbalance resulting in absence of periods. Pregnancy
with an intrauterine device
is very rare. Your doctor wants to see if your uterus
responds to withdrawal. This is the purpose of giving the medication. It is a progestogen and withdrawal bleeding usually occurs 3-7 days after completion of treatment. A trans-vaginal sonogram should assess the status of the pelvic organs as well as the presence or absence of pregnancy. Hope this helps.