My Girlfriend and i had sex 2 days after the last day of her period. About 21 hours later I gave her plan B. (We did not have unprotected sex ,i used a condom, but I put it in for about 6 seconds in the beginning without a condom). Also i did not ejaculate. A week later, she tells me she is on her period. The blood is dark red and she says it feels like her period. Is she on her period? If she's not, what are the chances of her being pregnant and when should she expect her next period?