is my girlfriend pregnant

ok so me and my girlfriend have been dating for a little while and we had sexual intercourse exactally one week ago, she has been saying she doesnt feel good, and complaining of her stomache hurting, i used a condom ( which didnt break) and did not ever penetrate without one, she was also a virgin, could she still be pregnant even though the condom didnt break. her and i are worried someone please give me answers we are young still in high scool not ready for a baby please i need answers