Taking a pregnancy test after the date of an expected period is a fairly certain method for confirming pregnancy. The results of such a test are valid. If your pregnancy test was negative, you are not pregnant. You are not, however, telling me enough information about your menstrual cycles before you started taking “ortho evra”. Nonetheless, it seems that the regular weekly vaginal bleedings were not real periods but false menstruations. In your case, a late “period” could be a sign of cycle normalization. You will need to visit a gynecologist for an ultrasound examination of the ovaries and the uterus. You can also request hormonal analyses. It is very important to see if you have ovulation or not.