I was off my birth control and not sexually active for about two months after being on it for about five years straight. I had just got back on it for a month and became sexually active during the second week of being on it I also, on a whim picked up some St. John's Wort and took it for only a day before learning that it can make birth control ineffective. So my question is: Is there a chance that I could be pregnant? Lately I have woke up twice in the middle of the night and gotten really naseous to the point of having to lay on the floor when I got up to go to the restroom. Also, the sight, taste or thought of alcohol makes me sick to my stomach. Whereas I previously have never had a problem with it. I am a week away from my next period and was curious if I have anything to worry about.