I HAD WITH MY G.F. YESTERDAY USING COMDOMS BT STILL SHE IS SAYING THAT SHE MIGHT B PREGNENT BECOZ SHE IS?

FEELING LIKE VOMITTING AND NOT FELLING HUNGRY AND ALSO SHE IS HAVING PAIN IN WHILE URINATING AND SHE HAS SOME GAS PROBLEM ALSO.IS ALL THESE ARE SYMPTOMS OF PREGNENCY