~~!!~!~HUGE QUESTION!!!! Is this possible??? HELP!!!~~!!?

Getting straight down the the point, me and my girlfriend had oral sex (her to me). she swallowed and slightly later i kissed her. a little later than that i performed oral sex on her. a little later we had all these scares about pregnancy that put loads of stress on us. She had brown discharge (light at first but then followed up as normal) and also a white discharge before the brown I believe (maybe after?). We were very scared until she got her period, which was COMPLETELY normal. We thought we were in the clear, but now she is having the next period that is due and since she has started her period, she has had excruciating pain that she said she hasnt ever had before. Ive heard this could be dysenorrhea (or however you spell it). She is on the second day of her period and she had it last night and said its a little worse tonight. Could she be pregnant even after the normal period? (oh yeah and other than the really REALLY bad cramps her period is completely normal). is there a medical problem she needs to be concerned about? Shes going to the emergency room if it doesnt get better but im really upset by this =( thanks for all the help!!!