Chances she's pregnant?

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My girlfriend has been on BC for about a month and we have had sex twice, the first time was just a quicky "put it in my" for like maybe 7 seconds, she was new to BC and I'm fairly certain she wasn't ovulating, the next time she was about 4 weeks into BC, and I had sex with her, with a condom on and I with drew, approximately 3 days later she had her first period, a week or two early, but that's because she was on the placebo pill for that week, her period was lighter and brownish red (she takes low BC for irregular periods and acne) and it lasted for a length of 6 days. She's been so emotional lately but she's always emotional and i know BC makes it worse. I guess my question is, is there a chance she's pregnant? Or does this period indicate that she's not pregnant