During sex a little seman might have leaked out base of condom. my gf takes bc pills everyday at the same time for 8 months. are there chances she could become pregnant? had sex 2 days after perio

Not likely : Birth control pills when used correctly are very effective at preventing pregnancy.

Low risk: Given that many folks use only birth control pills have a low pregnancy rate (8 % risk of failure in typical use), you are low risk for a pregnancy. There is an infectious risk associated with a condom failure though, so touch base with your partner and determine if that risk requires follow up.