I have been on yazmin for the past year. My boyfriend and I usually have unprotected sex about once every 3 weeks or a month. Lately, it has been twice in one week. I want to know are my chances higher to become pregnant with the more times we have intercourse?

In the future I would like to become pregnant, but I have to stay on the birth control to manage the symptoms of my endometriosis. Also, since I am on birth control, how would I know if I am pregnant?