worried is it pregnant?

hi my name is richard. my girl friend was suppose to have her period on the 25th of this month but however it has been 6 days late. and we are having protected sex and i did not ejaculate inside her. we also took the condom to see whether there is any leakage or break by using water. but however there is no sign of leakage. could this delayed period means that she is pregnant? and i notice there is some white thing inside the condom. im using a lube condom that is durex close fit. but im pretty sure that i did not ejaculate inside her. can someone or any expert here give some help ? as im very worried and paranoid right now. 

is it normal to have period delay? and how long usually it delay after having sex one week or days before her actual period with condom?and does drinking herbal mint diet tea might affect it too? how about cold like flu or cough?