Is my girlfriend pregnant?

Patient: Himy girlfriend and i havent had sex for 3 months now, but she told me yesterday she is 15 days late this month, she has had 2 periods over the 3 months, but anyway, after we had sex, she took a plan b pill just incase. she has taken several of these in the past, i was wondering if that could still be messing with her cycle? some symptoms she has right now are: 15 days late, breasts tender (she says they always are though), vagina discharge (she said she always has it, typically heavier before periods), and slightly bloated.