I start drinking pills for 7 days and have sexual contact on the seventh day. Will there be chances that I will get pregnant?

Depends! Your chances of getting pregnant depend upon use of condoms and what type of pills you started taking. Blood pressure, cholesterol, diabetes, depression pills, etc won't affect chances of getting pregnant. If you're referring to birth control pills, start date relative to your period affects effectiveness. http://www.plannedparenthood.org/health-topics/birth-control/birth-control-pill-4228.htm.