Hello;
Me And My Girlfriend Were Flirting In The Position That She Was Laying On Me And Her Genitals Over My Penis.I Ejaculate In My Pants Then My Semen Soake My Trousers And Then Soaked Her Trousers In Somewhere inThigh Near Her Genitals But I Think My Semen Hasn't Soaked Her Pants In Genital Area.she Has A Delay In Her Period And Is Vomiting And Nausia From One Week After What Happened.could She Be Pregnant?

In this case it is highly unlikely that she is pregnant, however, it is possible on rare occasions.

How late is her period?

In this case it is highly unlikely that she is pregnant, however, it is possible on rare occassions.

How late is her period?
Today is the 4th day

She could have the flu. She should go to the doctor to find out exactly what the problem is.