Can i become pregnant while i'm on nustrate?

Very unlikely but...: No hormonal birth control method is 100% effective. If worried about pregnancy, can do a test. A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred). If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test.