I'm not sure I am understanding your post right. Are you saying that you did not know that you were on the birth control patch? How could you not know that? I'm not sure when you would ovulate and your question was cut off. Please email me at CHERYL51@aol.com or please post again with more details. Anytime you have sex, you risk the possibility of getting pregnant or contracting a sexually transmitted disease. No method of birth control is 100% safe from pregnancy or STDs except abstinence. Talk soon.