Hi, so my girlfriend has been on birth control pills for well over a few years. She is very responsible when taking them. She rarely ever misses a day. After having sex without a condom, she informed me that she took just 1 pill of St. John's Wort the day prior. I understand that the key ingredient in this pill is Hyperforin, which makes the body metabolize drugs at a faster rate. Although she uses birth control, I always withdrawal (pull out). How fast does Hyperforin affect the body? If she only took one 1 dose, should I be worried? Respectfully, we are not wanting a pregnancy at the moment. I understand that maybe none of you are certified medical professionals, but if anyone has any experience/advice, it would be much appreciated. Thanks!