When on birth control pills, how long after taking antibiotics are you at risk for pregnancy?

From what i've heard 2 weeks but check with your doc.When on birth control pills, how long after taking antibiotics are you at risk for pregnancy?
It depends on how long you take the antibiotics and what kind they are,my guess would be 4 to 6 weeks.that's about how long it takes for any drug to get out of your system.