I am on birth control (sprintec, which is generic for ortho-tri-cyclein), and have been for the past nine months or so. I also have been taking for the past two to three months, St. Johns Wort in hopes of supressing some anxiety. I was unaware that this can interfere with birth control, and have stopped taking it as of today. I understand that birth control is only nine percent effective against pregnancy, how much would you think that St. John's Wort has lowered the effectiveness of my birth control? Is it anything I should be worried about?