my last period was 2 months ago, not like regular, very less flow, and brownish.. My husband hasnt ejaculated inside me. Since yesterday i am on Norethisterone for 3 days to regulate my periods. My urine tests came negative for pregnancy. The doctor didnt examine my stomach, but did a urine test. So is it confirmed that I am not pregnant & can safely take this medicine? Is there any possibility that it will be otherwise?