A while ago I was prescribed Flucanazole once a week every week for 3 weeks for a chronic yeast infection. However, they never told me if there was an interaction between birth control and Flucanazole. I m now worrying if I am pregnant because I didn t use protection while taking Flucanazole even though my partner pulled out. Is there an interaction between these 2 drugs? My periods got much lighter after taking Flucanazole also so I wasn t sure if this was also from taking Flucanazole or a sign that I could be pregnant since it decreased the effectiveness of my bc.