However, no way to be sure--and now that you have been treated, there will be no way to know. In other words, because chlamydia (or gonorrhea
for that matter) is at least a small possibility, your regular GF really should be tested. (Yes, you certainly could have infected her by having unprotected sex 2 days after your own exposure.)
Based on questions on this board, this happens a lot: People get exposed, panic, and get treated without being tested.