Hi,
If you were getting regular cycles in the past and not on any type of
contraception, then it is most likely that you could have conceived. Urine tests for
pregnancy do not often give the correct result when positive in the early stages as they are not so sensitive. You should get a
blood test for confirmation of pregnancy as well a sonogram.
Duphaston cannot cause withdrawal bleeding in pregnancy. If there is no pregnancy, withdrawal can occur up to 1 week after completing the treatment. You should consult a gynecologist for further management. Take care.