What Is Causing Abdominal Pain, Constipation And Acidity For My Girlfriend?

Hi doctor,My girlfriend is 24 years and i'm 25.Day before yesterday i.e. on 15-9-2011 at around 12 PM we had foreplay n she was naked while i had my undergarments on and for masturbation i used a condom so that no semen could touch her still she is in a lot of tension that she might be pregnant as some precum might have touched her.Though i used different hands to touch my penis and the hand which i used to touch her genitals but still she is very afraid that she might be pregnant as she is showing some signs of pregnancy like pain in abdominal region,constipation,acidity etc.Please suggest how can we be sure that nothing has happened.