If you two are not ready to be parents, I'd advise you to help her go to the pharmacy and get a prescription for the morning after pill. It sometimes is called Plan B.
It should be taken within 72 hours of unprotected intercourse to prevent conception.
Then, if she turns out not to have conceived, she needs to either be on another form of birth control such as the pill, along with the condoms so that she does not have a pregnancy before she is ready.
if you two arnt ready you should look into an additional form of bc as well as a condom. however you cant really tell if shes pregnant right now. your going to have to wait to see if she gets her period next week